I agree with RoadWarrior. On my '85 I bought headers that were for an '87-93 and they fit just fine. I had to buy a new X-pipe for an '86 and it bolt right up after I removed the heat riser thingy on the drivers side. Of course, you should swap to a double hump transmission mount to make clearance for the X-pipe.
If you want to go to a dual exhaust, I would recommend doing the headers, X (or H) pipe, and cat-back all at the same time. that way you don't have to retrofit anything then change it back.
And just to let you know, post technical questions like these in the Windsor Power forum. You will get better responses there.
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