Hey man, don't be blaming the car. You've just horribly mismatched the combo. A lot of people do it. Unfortunately, you're in a bit of a tight spot to get the serious power by adding more parts right now.
While the GT40 heads, the B cam, and a ported stock intake can improve the performance of a stock 5.0, the intake especially, restricts the amount of power you can make with a 347.
If you don't have the money, and you are dying to get more speed now, get a carb setup. Sell all your EFI stuff, you'll break even or do better. The heads will be functional, and with a good carb/intake combo, you'll make WAY more power than what you have right now.
I'm not a huge fan of the carb scene, I think it's generally a step back, but in your case, it'll be cheaper to get some power now. If you get a carb/intake that is good and tuned well you'll be going from your probable 250hp to more like 350hp. The GT40 heads won't support your desire for 400hp, but messed with a little, they should get you to 350.
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