Never used them but Thunderchicken has a good price for SBF coppers:
http://tinyurl.com/ygt8rof
He also has some interesting nostalgia cams in his store listings.
I'll bet lots of manifolds warped from improper torquing after removing the heads for service or whatever. As iron will bend, making sure the surfaces are really clean and then tightening new bolts to factory specs with a torque wrench should work well.
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Ford FE Forum:
http://www.network54.com/Forum/74182/
Ford Windsor Forum:
http://www.network54.com/Forum/119417/
Ford Cleveland Forum:
http://www.network54.com/Forum/119419/
Ford Transmission Forum:
http://www.network54.com/Forum/260730/