need to learn about camshafts....

This is the cam I run in my Magnum.

http://www.summitracing.com/parts/CCA-20-746-9/

It idles nicely with a little lope, has strong low-mid range torque, but also pulls fairly strong to ~5500 rpm. It's not quite right for my application (I need more cam) but it would be perfect for a truck (what I originally bought it for, spec'd by Comp Cams).

No modifications needed other than a valve spring upgrade.