Young Joe Louis already flattened an original clone of George Chuvalo, named Paolino Uzcudun in 1935. Uzcudun was a bull of a man from Spain who was never dropped or stopped, going 20 rounds with a young Max Baer and had an iron constitution ala George Chuvalo, til he met the greatest trip hammer puncher who ever lived Joe Louis...Louis early in the bout hit the Basque crouching Paolino with a right cross laser that landed on Uzcudun's chin knocking out his mouthpiece and several teeth in the process. Louis always claimed that was the hardest punch he ever landed. George Chuvalo was a sturdy tough heavyweight who I admired as a fighter and as a man, would never have lasted the distance with the 1935 edition of Joe Louis who flattened Max Baer and Paolino Uzcudun...Oh that edition could punch.!!
Louis-Chuvalo would be like watching a plane crash....and I like Chuvalo. It's just that Louis would bust him up and hurt him real bad. If Louis hurt him, and he would for sure, the ref couldn't let the beating continue like the ref let the Foreman fight go on. Louis would have killed him. The "never been decked" thing would be over for George.
Marciano wouldn't have beaten prime Louis and Chuvalo sure as hell wouldn't have either. Louis would win every round for a shutout decision win over Chuvalo.
In my mind the only way to beat Marciano would be movement, Joe Louis was right there for you to hit and that'd feed more into Rocky's hands..I dunno just my opinion.