Ali won Gold at light heavy but he would have been WAAAAAAY too green for RJJ at 175.

Prime for Prime you HAVE to take Ali because he was so much bigger and he took such a great punch and he had a great jab and could flurry real well too.

RJJ-Bob Foster, Archie Moore, Floyd Patterson, Evander Holyfield or Michael Moorer would have been good at light heavy, cruiser, or heavyweight