Rocky Marciano so he could fight at 185 and knock the snot out of everyone there and then move up and knock the snot out of every single small heavyweight up to 210 pounds. And NO he doesnt have to fight Lennox Lewis or George Foreman because they would be a full weight division or more above his stature.
Leave him goddam alone will ya? He was 5 ft 10 inches tall and 184 pounds dripping wet out of the shower. YOu really want him to fight the Klitschkos and Lewis and Fury and Bowe? hahaha

Jack Johnson. Let's see him outfox and then smoke to a crispy burnt duck all these imposters like Haye, Wilder, Adamek, Arreola, haha thats a great one, Arreola vs Jack Johnson. hahaha burrito

Primo Carnera---let's see him fight these huge super heavies now like Valuev, Bowe, K2, etc

Jake La Motta---let's see him go after the middleweights of today. Would be entertaining

Aaron Pryor so he could whip every single 140 pouinder in the history of the sport