Since i need a rering and new bearings, i had my 4.15 crank offset ground to 4.315. Bore is 4.5043, had line2line coat the pistons to make up the .0043 needed to clean up the bores. Basic combo was 15.1 to 1 compression, fully ported 440-1 heads, 3x intake, Terminter injection running methanol. Headers are 2 1/8 x 30 x4 inch collecters. Cam is a solid roller, 285 /296/114 @ .050 with .840 net lift after lash intake, .790 exhaust in at 110. I would hope to pick up. Both torque and hp a bit. Best et and mph at 3055 wt was 8.77 at 153 mph before.