As much as I like Ali, I don't think it would be an easy night for him, prime Tyson had devastating combinations, outstanding head movement and Defense, under rated jab, he could cut off the ring, very fast hands with KO power in each one and was aggressive as hell, he really could do everything well, he made Top 10 fighters look like bums, Tyson dosen't match up well for Ali.
Prime Ali had everything going for him but I don't think his chin was as good as when he came out of exile in the 70's, he was floored by 185 lbs Henry Cooper and Dundee sensing Ali was in real trouble pulled some stuffing out of a small split in one of his gloves, Dundee ordered a fresh pair of gloves be sent from the dressing room thus buying Ali an additional 1-2 minutes, for a top fighter in shape that could be the difference between victory and defeat, I'm not saying Ali wouldn't have beaten Cooper if he had only the 60 seconds but you never know...