Warranty 72 340 built

Plan to built this 340 for my 72 question is there several option of piston which I like to stay under 10 to 1 such as 9.6 to 1 what head gasket thickness and plan to use 68 4 speed cam and 3.55 sure grip drop in 72 340 4 speed duster any idea I like to see your input thrown in.