score! but i need help

I don't think that will get you 400 horses from a 360 or 318. Not at the wheels for sure. If your plan is a 360 then stick to your plan. You can live with the 318 for a bit longer. Can't tell you what 360 to get, I'm an old chevy guy and new to this Mopar stuff.

#1 rule....form a plan and stick to it. You will save a bunch of cash that way. If your end goal is to run in the 12s then only get parts that will put you there.