9 to 1 Piston for EQ 62cc Head

first time trying to use EQ heads, best power is made by close to zero deck......or using .039 gasket, i would use .028 mr gskt as before on my other engines with X and J heads with KB 232 Step Dish Pistons.
David Crower from Crower Cams (RIP) told me years ago that engines that keep carbon cleaned off the quench area made more power. Theory is more than .040 over the quench part of the piston and the fuel will not be reacted ...... Smokey Yunick
part number of .040 over size with +20.5 dish?