You should have 516 close chamber heads so dome pistons are out. i would look for a good set of flat top pistons, deck the block bringing the pistons to zero, use 214/174 valves in the heads with some bowl blending and port match cr should end up somewhere around 9.5 to 1, keep the cam in the 218 to 226 max @.050 range. and you should have a nice setup able to run 13's