hey, it's just my guess but i'd say on ebay... next to nuthin. i dont think anybody would pay to have a regular manifold. and would that be intake or exhaust? usually things that old are easy to find parts because it was just small block or big block, and you could easily find some performance headers or better intake for them. rather than tracking down an old used part. but their might be somebody out there that wants it all original, and they are the ones that would pay the most.