Here's the deal. I hate to say it, but that combo is pretty mismatched. He could be running stock injectors with an adjustable fuel pressure regulator at that hp level. 19lbers set to 58psi would get him about the same injector cycle and computer ability to compensate as stock. 24lb/hr injectors are almost right on at stock pressure.
The 30lb/hr injectors are probably beyond the computers ability to adjust injection cycles properly. What's fuel pressure set at? Stock 39psi regulator, or has it been adjusted? With 30lb injectors to simulate the stock injector cycle, it would need to be set around 23psi.
If your pressure is too low, you wind up getting a very poor spray pattern. Think of it like dripping fuel into the intake instead of a fine mist. The more pressure, the better mist (atomization) of the fuel you will get. Most fuel pressure regulators adjust to about 60psi. I've heard the injectors are good for up to 100psi, but running them up there wouldn't be the best idea in my opinion. When your fuel isn't properly atomized, it won't burn completely, or fast, and you'll lose power, fuel economy, and throttle response.
Here's the problem with the combo. The heads are too small for an optimized setup without serious porting (even then not the most powerful heads out there), and they are way to big for the stock intake. The injectors will always be too big for the N/A setup, but too small for a blown combo 347. The cam you didn't mention? If it's the stock cam, it's too small for the heads, okay for the intake, but it will never make the kind of power you want with that engine. If it's a big cam, (could be too big for the heads, which in turn will be WAY too big for the intake) Now, don't get me wrong, if what he wants to build is a torquemonster 347 with stock engine charachteristics only magnified, swapping to a ported Cobra intake, or going to a middle sized aftermarket intake will put him there with relatively mild cam, but the combo right now is deficient in some areas, and overkill in others.
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