Chris,I now believe +.020 will be the first oversize. I want to keep the asymmetrical valve reliefs and therefore I have to drop an option. I think that will be the adjustable Comp dist. As of now the standard piston will be the following:

Bore size 4.25 +.020,030,040,060. or 4.375 for 400 block.
Ring pack 1/16 1/16 /3/16
Comp dist 1.930
Asymmetrical valves reliefs or flat top w/o reliefs.

Leave the gun.......take the Cannoli's....Mike