Marciano would best do a Quarry and get Earnie out of there fast. I don’t think Rocky can take too many of those clubbing right hands
I'd take Marciano on pedigree, but as with any Shavers fight, if he manages to connect flush it could be a nap. Marciano would be well advised to close the distance fast and to keep it up close where his own reach is advantageous. If he can get through the first 3-4 rounds relatively unscathed he should be home free.