Ali prime weight:- 210-220?
Marciano prime weight:-183-189?

Ali reach:- 80inches
Marciano reach:- 68inches

Ali height:- 6,3?
Marciano height:- 5,10?

Speed:- ali
Footwork:- ali
Handspeed:- ali
Defense:- ali
Chin:- ali
Jab:- ali
Power:- marciano?
Stamina:- both?

If these two fought prime for prime ten times..on 7 occasions the fight would be stopped on a tko for ali for cutting rockys face to shreds and the other two a decision or ko for the Goat. Perhaps in the last fight marciano could get a KO? lets just give it to him.

Marciano will always be a legend in the game with his heart and courage and undefeated record.

But the frustation of alis movement, speed and accurate shots will be way to much for the brave and tough crusierweight.

Ps:- frazier would have beat marciano too.