I believe it was the Coach Bryant years. We beat Virginia Tech 77-6, or something close to that, in 1973. (And it wasn't running up the score. We probably played 15 RBs and 5 QBs in that game).
We've gotten to the 60s a few times since then, but I don't remember us crossing the 70 point threshold.
I remember as a kid we beat Rice or someone 66-0. I don't remember any 70's. The Bama's, Oky, OSU, Michigan, USC and Texas used to pulverize teams back before title whatever. You could be a Bama man and get a lot of playing time as a 2nd or 3rd stringer as opposed to starting at a lesser school. Play for the Bear.