Good suggestion, Joe. 

I'm not concerned about high pressure from supercharging (NA application), but I don't want to leave compression on the table, particularly with flat-top pistons. 

I would ask if the Cometic gasket if made for Mummert heads or the stock iron heads.  The Mummert heads keep the combustion chambers almost completely in the bore on the larger size bores.  You don't want gasket material in the combustion chamber.  Just a thought.  Joe-JDC

JDC

Has anyone used the Cometic MLS head gaskets vs, Best? The Cometic gaskets are expensive, but they come in various thicknesses and the bore size is smaller. I calculated the Cometic 3.86-bore gasket/w .040 compressed thickness to have a volume of 7.67 cc vs 10.00 cc for the standard bore Best. Wouldn't the Cometic 3.86 bore size be more than large enough for a cylinder bore size of 3.81? Generally speaking, shouldn't the gasket bore size be 0.030-0.060 larger than the the cylinder bore?