What JohnRR said, definitely do not use those pistons & get a set of kieth black hypers & adjust your deck height & with the right head gaskets to get your piston to head clearance(quench) at .035-.040 which will let you run a CR in the 10's. 93 octane will support this ONLY if you have .035-.040 quench. Squeeze is power & a high CR is the main parameter that makes it.