What cam to use.

Yep I agree .........you better check it. We use KB flattop pistons .025 down on my sons 400 with valve reliefs in the pistons. It has the MP .557 cam and 84 cc Eddy heads we cut .040 to get 10.2 comp with the .039 head gasket. It has over .150 valve clearence but like I said it has good size valve reliefs in the flattop pistons. Ron