Eddy heads 340 vs 360

A set of .060 to .070 compressed thickness Cometics will usually take care of most above deck 340 pistons with closed chamber aluminum heads. Like mentioned, measure beforehand and then select gaskets based on piston to head/squish/quench clearance (some people say that when it's right it's actually a tumble in the chamber, that the mixture is rolling through the across the chamber at the spark plug). That alternator clearance deal can be a real issue, even with aftermarket pulleys and their spacer selection. The less accessories you run the easier it is to overcome. A factory location AC compressor is a real pain to configure with aluminum heads.