Up Grades on Stroker-Suggestions

Your cam is limiting you even with stock RPMs and that intake. You can get significant gains by replacing just the camshaft. You are really only opening the intake valve about .485" and the heads only flow around 235-240cfm and the you have a big intake on top of that. If we work backwards from that 400NM (296 pound feet give or take) to the tires you're not making anywhere near the "2hp per cfm" general rule. Replace the cam with something in the 250° @ .050 and at least .580 lift before lash and it will wake right up. I don't see anything else that is glaringly "bad".