Do you have an FMU?? 40psi with 19lb/hr injectors on just an adjustable FPR and I'd expect your injectors to never stop. They must be on injection cycle constantly?
To keep the stock injection cycle you'd only be making 230hp. To simulate stock injectors according to the Stang Analyzer, you'd need 68psi (in tank pumps are rated at 70psi). I did some math, the stang analyzer is pretty accurate. You're asking your computer to compensate nearly 50% by injector cycle.
The thing to remember is that you are low compression, and he won't be. 350hp is right about where he should be.
Before upgrading injectors I would bump the fuel pressure. The pump should be running at 70psi for rated Lph, so setting your AFPR at 60psi should get you about 32% more flow or so. If your computer is capable of staying at that huge adjustment factor you'd be able to run 19lb injectors to 455hp, which is insane!!!! Bumping your fuel pressure to 60psi should allow for a better spray pattern, and a crisper injector cycle. I would expect a jump in throttle response, and better power levels with that if everything went by the book.
I cannot explain how you are able to obtain those numbers by math, but hey, it's a car so physics doesn't apply. You know, you drop a nut on the engine while you're working, and when you find it, it's at the back of the car wedged behind the tire. LOL!! I hate that!
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