Well, for my goal, i found a calculator as a rough guess and it said i need 605 horse engine to get it down to where i need to be. Its going to get main studs and all that good stuff. Just need to know if its worth spending an extra 300+ on a main girdle setup. Going to use 440 source rods and pistons. It'll be in a 4,000 pound shortbed truck that'll see the strip quite often.