Rockefeller loses some southern states but makes up for it by picking up the big northeastern states of New York, his home state, and Pennsylvania. With Reagan, Rockefeller holds onto the traditionally Republican states in the plains, mountain, and southwest areas. Reagan brings in California for Rockefeller, thereby proving his worth as the Vice Presidential pick.
Personally, I doubt very much that Benson would have accepted to run on a ticket with Wallace, however, with these three tickets, this is how I see the election turning out.
Rockefeller/Reagan 281
Humphrey/Muskie 169
Wallace/Benson 88