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I was looking at headers for my 1990, and then saw a pair of true duels from Mid AMerican Runs about 249-299. My thought is to add cats, and use the existing exhaust manifold.
If your going to do any future mods - go with the headers.
an alternative is to pull the stock exh manifolds and port/polish the snot out of them - talk to 65z01 (Jim) he is getting fantastic performance out of his dremel skills.