When I was looking for a 235 exhaust manifold I went to E-pay and bought a couple that were only so-so condition (if cheap) before I scored a really nice good one .
Best bet is to keep trolling the boards like this and also swap meets , I find that when I place a wanted ad on my back as I'm walking the isles , I get more responses for really good stuff , _CHEAP_ .
-Nate