There is a Clymer Stern Drive manual on e-Bay item# 2492024065 in e-Bay Motors. Includes 470 & various others from '64-'85. Early 460 non CJ wedge heads with exhaust port work (boss removed) and good 3-angle valve job using CJ valves used to work very well, altho I'm not familiar with the 4 cyl. There have been several aluminum high port heads as well, but I have'nt kept up on these for years.
