As for why the 1977 card isn't "Reggie-ed" out, my guess is that since Reggie would have been under contract to Topps, Fleer didn't want to risk any legal issues depicting an active player. In Clemente's case, he would no longer have been under contract to Topps. This is also why the 1970 Fleer World Series set had to remove active players and required new artwork from Laughlin's original 1967 B&W set.
For some great insight into the way Fleer approached things based on a 1971 interview with Laughlin, please see my post on the Topps Greatest Moments set, which foiled Fleer's plans for a Laughlin "Great Feats of Baseball" set which Laughlin ultimately released on his own in 1972.
http://fleersticker.blogspot.com/201...ments-set.html