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Hey folks...
For any of you that are considering building your own headers, here's a source for the flanges...Mark Sanders in SoCal. You can contact him through his email at mr_shakabra@hotmail.com, you might mention the size of primary tubes (1 1/2, 1 5/8, 1 3/4) you're considering using and that you want 1/2" flange stock if you're looking to keep the same plane/alignment as the intake manifold. Hope this helps.

Any idea on cost for the flanges?

I can't say what the cost would be as I had him make 3 sets for me. Probably best if you emailed him and inquired. Mark is quite easy to deal with and very fair...