440/493 stroker motor

These are the specs from Indys site on the heads-
440 EZ-1 • Long valve design(275ccIN) • Stock rocker shaft oiling • Stock exhaust port location • 2.19 X 1.81 valves • Stock rocker arms • 75cc closed or 80cc open chamber • Stock pushrod location • CNC Max Intake & bowl porting

I will have to get the part number for the pistons at home, I cannot remember the part #. They are flat top pistons though.