Jimmy, ask Dan what type of machine he used to deck the block and mill the heads? I hope he didn't use a broach. A broach leaves grooves on the surfaces.
All the above posts, guys with no leaks used some type of sealant; spray copper, silicone
The viton on the gaskets is so thin, it makes one think how they seal. There is a .001" layer of viton on the gasket. Go grab a venier caliper, and slide it to the first line, that's your .001. Too thin in my book. You have anything on the surface, it will be held up and not lay flat.
http://www.turbobuick.com/forums/engine-tech/226350-cometic-head-gasket-preperation.html
Billy T.
gnxtc2@aol.com