318 horsepower

That you need to cut some off the block via milling to get the piston (closer) to zero deck IF you are using those pistons (or the same compression hgt oversize) in your rebuild. OR you can get a set of pistons with some more compression height to take up that space.

i would want a more accurate method of measurment before i ordered any sort of machine work. that being said, if you are getting new pistons, i like these for a street build: KB167

http://www.kb-silvolite.com/performance.php?action=details&P_id=134

the number you came up with will let you use calculators (along with accurate chamber volume & compressed gasket thicknes) to map out your planned static compression ratio.

sb