I talked to kauffman last week and they were going out of town, thay may be why you cant gat ahold of them. I am doing something similar to my 400. I have a 67 bird with a 400 WITH 6X heads. I found a set of kauffman heads on the PY classifieds that were new in the boxes but pre owned for a few hundred less than new ones, I am having them ported by a local head porter. I didnt know about the cometic gaskets though. I may opt for a pair of those! I think the rise in compression and flow will make a bigger difference than the pistons, you should try and find a set of the kauffman d ports.
Chris
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Chris Collier
1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans
"There is no such thing as too much horsepower"
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