Not sure what the HP is but my 383 runs pretty good. It is in a 3650 lb. 69 Super Bee, old school TRW 12.5 to1 .060 over pistons,Lunati .507 cam, street dominator intake, 750 Demon carb. with Mopar aluminum 452 heads, 4 speed with 4.56 rear. Has run a best of 13.16 at 106.72 with a 2.25 60' at 5800 ft. I know there is a lot left at the line. And this is pretty much a 30 year old build other than the heads.