KB got actually 3 pistons for 440 with stock stroke

KB184 which is pretty much stock CH with quench step.
KB236 which is flat top and 0.065" higher CH
KB237 which is quench step AND 0.055" higher CH

These are going on the cheap, casted but Hypereutectic on $400 rate... after these you can go Diamond, Ross etc... being forged on $600 rate

With a Charger born in Chrysler assembly plant in Valencia, Venezuela