Tim, see if you can find a manufacturer's number on the pistons anywhere. If not, at least use a dial caliper and measure the height of the pop-up from the base crown of the piston to the top of the pop-up. How far will the piston be down in the bore at TDC when the motor is assembled? (deck height). Will it be at zero deck (crown of the piston even with the block deck) or will the piston be down in the bore slightly? How far? Do you know what head gasket you're gonna use yet? Don't buy head gaskets until you answer back about the deck height. Did you have Lunati choose the cam or did you spec it yourself using the dynamic compression ratio method?