Right on, another mud guy. I was thinking about using one of those comp extreme 4x4 cams in my 461, only issue is I need 15" of vacuum in my class. my latest engine is a .030 454 with 215 heads, .219 valves and flat top trw's. I am running a melling torque cam in it, same cam that I had last season on a stock motor with smaller valves and I had a hard time getting more than 4800rpm out of it. you must be running in shallow pits to run 40's on a small block, I run 35"boggers with 5.13 gears and I still need low range.