I know, he was the man of my time. But wasn't he just competing in a weak era? I can't imagine a prime Ali having any trouble with Larry.
Ali handles him fairly easily.
Tier 1 - Ali, Louis, Lewis
Tier 2 - Marciano, Dempsey, Tunney, Holmes, Foreman
Tier 3 you start getting into the Fraziers, Tyson's, Klitchskos, Listons, Holyfields
With a special shoutout to the old timey fighters like John L Sullivan, James Jeffries and Jack Johnson