I may take some heat for this...
It is truly impossible to compare eras. No disrespect to greats of the past, but the pre 70's teams would be destroyed by any top 20 D3 team of today. I talked a bit about that issue in my first Trickle Down column. Sports nutrition and weight training have created super-athletes. Every team has linemen who weigh 300# and run 5 flat or better. Linebackers like McClain didn't exist...250# and run like gazelles?
If you look at the 1978 team, the biggest player on the team went 260 or so. Dwight Stephenson was 225 at Center. OT's Brock and Bunch were 230ish. They would not match up well against a middle of the road D1AA team today.
Looking at the great 1966 team, there is no comparison to modern day. Most of our offensive linemen were in the 200# range. The great defense from 1966 featured a line that was in the 200# range. There was only one backer on the team over 200#. As much as it hurts to say it, those teams would lose badly to South Panola High School. South Panola has as much or more talent on their roster than the entire 1966 NCAA Top 25 combined. While the Alabama players on the 1966 team would have South Panola beaten in age, the high schoolers would be so much bigger, stronger, and faster, that it would not be close.
Grit, determination, and competitive spirit, are qualities worth their weight in gold, but it reaches a point where pure physical superiority is insurmountable.
In perspective, if you had a time machine and could send a player off of this year's Bama team back through time, there is not one player on our 105 that would not start on the 1966 team, with the possible exception of QB. Snake was good, but then he didn't play against defenses that were as good as today. Facing smaller, slower competition, JPW (or any of our QBs) may be better than Stabler - but there is no way to know. Kenny was known for his ability to scramble, but I bet JP is significantly faster. He is taller and over 30# heavier. Heck, JPW is bigger than 24 of the 29 linemen on the 1966 roster, and probably stronger than all of them.