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Ceramic coated should be high on the list of options. They keep the under hood temps down. Also some companies have a ball socket on the collector end [Hooker I think]. I really like that option, no gasket required or ever to blow out. Plus easier alignment. As c3 dk showed, long tube headers are best for power increase. 1 5/8 tube dia is good up to at least 500 flywheel HP. T
I could be wrong but I think the stock manifolds for a 200h.p. engine are adaquate,with headers you'll lose some low rpm torque and gain at the higher rpm range. Since a 200h.p. 350 c.i. has a low rpm limit,you'll never gain what you've lost.Aside from a good tune up low restrictive mufflers might be better.Another thing to consider is go 1 or 2 gears steeper in the rear,if you have a 3 series carrier it would'nt be that expensive. If you're going to do mods to the engine forget this advice.