Wilder has all the physical advantages but has fought No one of note. I can't pick him against an all time great. Maybe in three years it's a different story but as of now the rock wins.
Wilder by KO. Too big, too fast and hits too hard for a bulked up LHW Marciano to take. Wilder has poor boxing skills and a fragile madible though so there is a small chance he gets knocked out.
Rocky was not a bulked up LHW. He was a boiled down HW. He walked around not overweight at ~ 203, & i have heard punched harder there. Though his work rate & stamina must have been greater ~ his usual peak weight, mid-late 180's.