I think Tyson demolishes an older and slower Foreman. Others disagree. The fight was talked about quite a bit but never happened.
That is by and far the most likely outcome. Foreman struggled with non-contenders like Schulz, Stewart and Savarese. He got beaten pretty bad by Morrison and Holyfield. Moorer won nearly every round untill his glass chin let him down. A weakness that Tyson doesn't have. Tyson was not at his peak anymore, but still good enough to destroy Stewart in one round (who gave Foreman hell if not beat him), beat Ruddock twice, Bruno, etc. Old Foreman was too slow to get his punches off against someone with lightning fast hands like Tyson. He also lacked the power to knock him out. Aside from Moorer, Foreman never scored a knockout against decent (not even good) opposition in his comeback.
I'd pick Tyson over Foreman. Both in a prime-for prime sense, and in this case a mid-90's matchup. Explaination below: http://www.eastsideboxing.com/forum/showthread.php?p=173162#post173162
And you don't think George's style was made for Tyson? A big, slow, and immobile fighter against Tyson? Come on! Tyson wouldn't be able to miss George!