I just built a std bore 427 with trw 12.5:1 pistons on 3/8 dimple rods, 6223 crank , gm 840 heads sq. port closed chamber 2.19/1.88 valves, comp .638/.638 solid flat tappit cam, single plane intake, 1050 dominator, what kind of power could I possibly be making with this setup??? I will be changing the upper half to a set of 840 heads ported and 2.25/1.88 valves with a .760/.760 roller what kind of increase will this give me or is it the right combo?? thanks