^Great recipe. You can also put those heads, cam, speings, retainers, rockers, intake, etc in your mechanical fuel pump block if you want to retrofit it to a roller cam. If you want to stay flat tappet, there are plenty of good cams. My crate engine is rated at 350HP/400 ft. lbs. It is the old style 2 puece rear main, mechanical fuel pump, flat tappet block. It has Vortec heads and a mild performance cam 218/218 .458/.458 on a 110 LSA .