To help for Pontiac doners cars (& a good source for Pontiac V8 parts) here is what was used in the '78-'87 G.P's. '78-'80, '83-'87 the 305 was the only SBC avalible, '78-'81 a Pontiac V8 was avalible. The diesel 350 was used '81-'84. All years has Buick V6. The 4.3 FI V6 was '86-'87. Bonnevilles, LeMans, & GrandAms are the same for each year/engine options ('78,'80 GrandAm V8 only.)