What headers work, and what don't?

The factory manifolds are not a good comparison as they are a collector piece, some folks have to have those parts for a resto and they didn't make enough to match supply.
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oh you can buy 340 exhaust manifolds new. cost ya $900 though. :) http://www.accurateltd.com/340-Exhaust-Manifolds-Pair_p_9-162.html#