Did not the game used to start at 8 p.m.? or was it 7:30?
Most of the games in the 60's and early 70's started at 8:00...but the games were usually over before 10:30. No TV or radio timeouts and the pace of the game was much quicker. If you were broadcasting the game, you had to work around the flow of the game, not like now when TV dictates when play resumes.
I recently watched the '71 Orange Bowl that we played against Nebraska on you tube. (at least I THINK it was '71) The video was shown was the real time broadcast of the game including commercials and halftime show and I was stunned that it lasted much less than 3 hours.
I do remember watching that game on TV live on New Years night. It was always such a rare event for LSU to be on TV back then, that the memories are burned in!