Personally, I'd place Larry "The Racist" Holmes below the following heavies:

Muhammad Ali - (no need to explain)
Joe Louis - (ditto)
Jack Johnson - (Made a much bigger impact on the sport of boxing than Larry ever did).
Mike Tyson - (ditto)
Lennox Lewis - (Better fighter than Holmes; faced better competition).
George Foreman - (see Ali, Louis)
Joe Frazier - (see Ali, Louis)
Evander Holyfield - (Successfully came up from LHW; hugely successful career as HW).
"Rocky" Marciano - (See Johnson, Tyson)
Jack Dempsey - (See Johnson, Tyson)

To this list, I'm tempted to add Wladimir Klitschko and Sonny Liston. And since I dislike the (cough) self-promoting "Easton Assasin" so much.... I probably would.

So that would make Larry, let's see..... hmm..... 13th?
And he said Marciano wasn't fit to "carry his jock".
Sorry Larry.... it's probably the other way around.