440 low compression build

Hot Metal said

L2355's are 6pk pistons, speed pro,CHRYSLER 7.2L/440 Mopar big block RB Speed Pro Pistons

Keith Black>CHRYSLER 7.2L/440 Keith Black/KB Pistons Parts and Accessories

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Will go with keith black pistons as can get piston and ring kits.

Would i need step head or flat top to increase cr. Also how to i work out what size compression hight i would need