I recentle purchased one of GMs 350/290hp crate motors. I want to improve it befor I put it in my car. Because it has no intake or carb I figured that this would be a good time to add what I need to get the hp I want. I would like between 375-400 hp. I was looking at the Sytemax II but the price seems to keep going up. I could get a good deal on a set of GM fast burn heads with 1.5 roller rockers. Would these and a different cam get me in that hp range?