LOL This is just too funny to even debate. Ali in his prime would have destroyed Tyson. He was too tall, too fast, too talented, and WAY too smart for Tyson. It would have been a TKO after Tyson was cut up and broken down.
Tyson, a pressure fighter like Frazier and a good volume puncher would be a bad matchup for Ali. Not to mention that in Tyson's prime, his defense was good, he was actually quick (not necessarily laterally though) and used a lot of head movement which allowed him to pressure his opponents without eating too many shots.
Tyson wins the 1st fight by TKO stoppage in a trilogy while Ali takes the next 2 by UD.
I think Tyson as great of a fighter he was in his prime would have trouble with taller, lankier fighters. and it's Ali, I wouldn't doubt Tyson's power that he could probably knock out Ali but I just don't think Ali would allow Tyson to come remotely close. Frustrated and tired Tyson? game over!!!