OK so I checked my motor and all the Pistons are sticking out .027 so with a Cometic .070 gasket I would have .043 piston to head clearance. The next step down in off the shelf gaskets would be .060 which would give me .033 piston to head clearance. With the .070 gaskets I calculate 9.658 comp. and with the .060 gasket it's 9.892