Quote Originally Posted by 383 chev
10.0-1 is a bit much for pump gas with iron heads i would take the heads to a machine shop and tell them what u want for a cam and they will get the springs to go with that cam and let them do the machine work. IMO you will lose some bottom end with the larger valves.
My Michigan neighbor is right on with the 202's--If your not on it most of the time smaller valves will give you more grunt on the street!