[68c10owner]

As already said, the only real difference from 85-86 is the crankshaft went to 1 piece seal. TBI didnt come out till 87` on the trucks and up to 1986 still had the old style perimeter valve covers and the regualr intake manifold bolt pattern, not the center canted bolt holes. all you have to do is get the 1985 crate engine which will be a 2 piece engine and get a flexplate for a 2 piece seal engine and your good. Just remember that some of the later 80`s 350`s had external balanced flexplates so be carefulle. I put a 93 TBI 350 in my old 75 gmc with a carb and had to get a 93` flexplate because of the external balance.