what has been done to the heads that you need that kind of lift ??i use cams that are about the same spec's in 10to1 400s with very good power but i'm using alot more head then you have. if you have it and don't want to buy a different one then run it. but the heads are know were near flowing enough air to use all that cam. make sure you check piston to valve and like nitro said have someone drill the steam holes..