As others have pointed out, that scenario is impossible. A BCS conference champion gets an AUTOMATIC bid, and the top two teams in the final BCS poll get AUTOMATIC bids. So in the theoretically possible, but highly unlikely, situation where two teams from the same conference are 1-2 in the final BCS standings, but a third team wins that conference championship, all three teams are in. That's the one and only exception to the maximum two teams from a conference rule.