400 low buck dont give a

ok, ok, ok, here's what ya do..... Shave the heads bring up the compression. Use what ever gasket you want as long as it figures into you compression figures. While your at it polish the combustion chambers. Bring the compression as close to 10:0:1 as possible with out going over. Check your valve clearance cut pockets in the piston if more lift is needed. Use something like the 509 cam. Holly single plane street dominator intake. 750 cfm. vac. and get the spring kit to adjust the secondairs opening rate.