My Combo, Right or Wrong!

To be honest, without flow numbers for your heads (not the "general" published ones I was looking at..You need to take into account your castings, and your valve job..) you're kind of tossing darts anyway. I also dont put a ton of faith in algorithms the dynoprograms use. They really generalize too much to make them totally believable. I agree with BJR on the cam, but I dont think you'll ever see the high side of 450hp with stock or even mildly modified factory Magnum heads. I'd say 430hp/430tq with the better cam choice and the rest left alone. With a better set of heads, you could get a bit more from it.