I just removed the original two-piece exhaust manifold w/turbo yesterday. Been on there for almost 34 years. Have new studs, new Gturbo 350 and PDI Intercooler. Wondering about the manifold, did you try to order new collar, rings, etc that go between the two manifold pieces? Or just order a new manifold? Mine is a bit rusty and was going to soak in Evapo-rust.
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Would be best to order new rings, with the rubber o-rings and metal collar that joins the two manifold pieces together to be safe. I used a tiny dab of grease to keep the rings in place as the manual does specify an orientation when putting it back together.