MIAMI, Fla. —  Sometimes, the buildup to a game can overwhelm what actually happens on the field.

Certainly, No. 1 Notre Dame and No. 2 Alabama would have to play nothing less than a classic to live up to all the hype for tonight’s BCS championship.

Before either team stepped on the field in balmy South Florida, this was shaping up as one of the most anticipated games in years, a throwback to the era when Keith Jackson & Co. called one game a week, when it was a big deal for teams from different parts of the country to meet in a bowl game, when everyone took sides based on where they happened to live.

North vs. South. Rockne vs. Bear. Rudy vs. Forrest Gump.

The Fighting Irish vs. the Crimson Tide.

College football’s  two most storied programs, glorified in movie and song, facing off for the biggest prize.

“It’s definitely not any other game,’’  said Alabama linebacker C.J. Mosley.

For the Crimson Tide (12-1), this is a chance to be remembered as a full-fledged dynasty. Alabama will be trying to claim its third national championship in four years and become the first school to win back-to-back BCS titles, a remarkable achievement given the ever-increasing parity of the college game and having to replace five players from last year’s title team who were picked in the first two rounds of the NFL draft.

“To be honest, I think this team has kind of exceeded expectations,’’ coach Nick Saban said Sunday. “If you look at all the players we lost last year, the leadership that we lost ... I’m really proud of what this team was able to accomplish.’’

That said, it’s not a huge surprise to find Alabama playing for another title. That’s not the case when it comes to Notre Dame.

Despite their impressive legacy, the Fighting Irish (12-0) weren’t even ranked at the start of the season. But overtime wins against Stanford and Pittsburgh, combined with three other victories by a touchdown or less, gave Notre Dame a shot at its first national title since 1988.

After so many lost years, the golden dome has reclaimed its luster in coach Brian Kelly’s third season.

“It starts with setting a clear goal for the program,’’ Kelly said. “Really, what is it? Are we here to get to a bowl game, or are we here to win national championships? So the charge immediately was to play for championships and win a national championship.’’

Both Notre Dame and Alabama have won eight Associated Press national titles, more than any other school. They are the bluest of the blue bloods, the programs that have long set the bar for everyone else even while enduring some droughts along the way.

ESPN executives were hopeful of getting the highest ratings of the BCS era. Tickets were certainly at a premium, with a seat in one of the executive suites going for a staggering $60,000 on StubHub the day before the game, and even a less-than-prime spot in the corner of the upper deck requiring a payout of more than $900.

“This is, to me, the ultimate match-up in college football,’’ said Brent Musberger, the lead announcer for ESPN.

Kelly molded Notre Dame using largely the same formula that has worked so well for Saban in Tuscaloosa: a bruising running game and a stout defense, led by Heisman Trophy finalist Manti Te’o.

“It’s a little bit old fashioned in the sense that this is about the big fellows up front,’’ Kelly said. “It’s not about the crazy receiving numbers or passing yards or rushing yards. This is about the big fellas, and this game will unquestionably be decided up front.’’

While points figure to be at a premium given the quality of both defenses, Alabama appears to have a clear edge on offense. The Tide has the nation's highest-rated passer (AJ McCarron), two 1,000-yard rushers (Eddie Lacy and T.J. Yeldon), a dynamic freshman receiver (Amari Cooper), and three linemen who made the AP All-America team (first-teamers Barrett Jones and Chance Warmack, plus second-teamer D.J. Fluker).

“That’s football at its finest,’’ said Te’o, who heads a defense that has given up just two rushing touchdowns. “It’s going to be a great challenge, and a challenge that we look forward to.’’

The Crimson Tide had gone 15 years without a national title when Saban arrived in 2007, the school’s fifth coach in less than a decade (including one, Mike Price, who didn’t even made it to his first game in Tuscaloosa). Finally, Alabama got it right.

In 2008, Saban landed one of the greatest recruiting classes in school history, a group that already has produced eight NFL draft picks and likely will send at least three more players to the pros (including Jones). The following year, the coach guided Alabama to a perfect season, beating Texas in the title game at Pasadena.

Last season, the Tide fortuitously got a shot at another BCS crown, despite losing to LSU during the regular season and failing to even win its division in the Southeastern Conference. In a rematch against the Tigers, Alabama romped to a 21-0 victory at the Superdome.

The all-SEC matchup gave the league an unprecedented six-straight national champions, hastening the end of the BCS. It will last one more season before giving way to a four-team playoff in 2014, an arrangement undoubtedly that was pushed along by one conference hoarding all the titles under the current system.

“Let;s be honest, people are probably getting tired of us,’’ Jones said. “We don’t really mind. We enjoy being the top dog and enjoy kind of having that target on our back, and we love our conference. Obviously, we’d rather not be a part of any other conference.’’