Mopar purple .528 for a 383?

MOPARMAGA said
Assuming it's a standard bore, assuming flat top no valve relief pistons, assuming true stroke 3.375 same for rod length, combustion chamber and other variables you'll be around 10.5-10.6

I thought factory 383 HP pistons sat above deck at TDC, or is it just 340 pistons that do that?

I think it's time to do some measurements on where those pistons actually sit before going much farther...