I did a swap on a 85 el camino last year for a customer, it had a 305 and we put in
a gm crate ZZ3, only problem I had was the throttle/ kickdown cable bracket to the intake had to weld some new ears on it. And there was a brace for the a/c comp. that I had to use a 1 inch spacer where it bolted to the intake, Hope he made it thru the IM240 emission test (LOL) as he opted for the hotter cam, But I warned him fore we started........