87 exhaust manifold

[ppscugog]

Does anyone know the difference between the 1987 exhaust manifolds and the 1988 -1995 manifolds for a 5.7 L TBI 4X4 ? Several of the major suppliers have a part number that is specific to 1987, then a different part number for 88-95?

I need new manifolds for my GM crate engine because my old ones have shrunk to much to be re-used. (The Goodwrench engine is built to be like a 1994, I was told). I want to transfer all of the plumbing from my 1987 but don't know what exhaust manifolds to buy. They look the same in the photos.

Thanks