FWIW, My buddies 70 Challenger is 496 c.i. and sports a 262 duration @.050/ .600 lift solid roller and is about as docile as it gets. All kinds of torque everywhere. And it is an auto car. I think a similar cam would be excellent for you. You could go with a flat tappet solid to keep the cost down and accomplish similar results. Large cubic inch stroker motors swallow up cam duration Don"t be afraid to put a big stick in it.