[moparcolt]

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