gm 383 crate engine with 196/207 degree roller cam and vortec heads, gm intake and 625 demon carb makes
338hp and 444 ftlb of torque
Add 1.6 ratio rockers and power goes up to
355hp and 453 ftlbs
Add a rpm intake
370hp and 467 ftlbs
add a 750 carb
379hp and 474 ftlbs with a tiny, smooth idling cam.