"After serious thought, I think I need to at least get thinner on the gasket to compensate for the loss of DC. I was thinking a MR. Gasket with .18 to .20 compressed thickness??"

You need to get the heads off and check the deck height before you make a decision on the head gasket you're going to use.

" Oh yea, whats the deal with all the different bore sizes for gaskets that are supposed to be for a 350CID?? Arnt all 350CID standard 4.000 bore???? The Mr.Gasket that I want only comes in 4.100. Will that work."

It all depends on what the final bore is and how much chamfer the machinist leaves at the top of the bore. You don't want the gasket overhanging the bore at the top because it could become a hot spot to support detonation. You also don't want the gasket so big that it leaves a dead space between the top of the block and the head.