If your pistons are advertised at that, make sure what the 'compression height' is of them and CC's of the heads to determine actual compression with your given gasket thickness. Don't know what they are doing these days but not all that many years ago pistons were advertised for 'max' compression which took place after maximum head and block milling and the thinness possible gaskets.....anyways, a long time racing buddy built a 318/390 awhile back with a turbo and his 95 Dakota made it into the high 9's before he messed up and ran it too lean one night and burned a piston. Now he has a 360 but as of right now, I have no info on that one.