One of the pack rats here should be able to find a manifold that'll sandblast up nicely. Finish it with VHT "Nu-Cast" for a good look. By the time you do that, why pay for NOS or an imported replica?
As to headers - try the Pacemaker with Y-pipe. But that is a lot more money than a used manifold by the time you factor in lock bolts, gaskets, installation and so forth. Also it will not make a real difference on a stock motor besides maybe a small fuel saving. Depends what your plans are for the block.
Regards, Adam.