It looks like egr and drain back gaskets are the same as 86-7 but just going off pics. I did go through my massive gasket hoard and found a 3 bolt flange header collector gasket that the 3 bolt holes line up on the intake but it has a bigger opening on the gasket 2.55" I just ordered a 2" and 2.25" id to try. The intake hole is 2". The 2" id gaskets bolt holes are just barely shy of the intake bolt holes and I'm thinking they will work best. That's if my Harbor Freight digital caliper is not lying to me