Prime Mike Tyson vs Prime Rocky Marciano,honestly Marcaino was overrated I believe Tyson will KO him THOUGHTS?

You're absolutely right. Tyson was bigger and faster than Marciano and his head movement will make him hard to hit. And with Marciano's weak chin (He got knocked down by aging fighters Archie Moore and Jersey Joe Walcott) and propensity to get cut, I think Tyson will knock him out inside 5 rounds.