Lets not forget gearing;with the Olds you probably won't have the revs you would with the Chevy,and unless you put some work into re-gearing the rear end,you'll be twisting it kinda tight at highway speed.
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck