For a few bucks more (&17.79) $409.39 vs. $391.60 (Summit prices), get the light weight LW2355 piston. It's 99 grams lighter (773 vs 872) than the standard L2355 piston, and uses 1/16" rings.

Milling the block to zero deck the pistons, 0.040" head gasket, and 82cc heads is about 10.2:1 compression.