Welcome to my impossible task, ranking all 79 national champions. Good luck making fine distinctions within a group of teams that were all, by definition, better than any opponent they faced in their seasons of glory.
Impossible, but not un-attemptable. I gave it a shot, and you'll notice that the two decades following John Wooden's first national title at UCLA in 1964 figure rather prominently here.
The era that began in the 1960s and stretched into the 1980s had two things going for it. Unlike (or at least more so than) their predecessors in previous decades, the top coaches of that time were able to recruit nationally and pull the best talent to their campus.