The computer will adjust the pulse width of the injector to give it the factory setting. I also beleived increasing the pressure helped and it sorta does...
The increase in pressure will be found after you are at 70% throttle then if your regulator is set at 40psi you will get the extra fuel which will make you 19lb injector act like a 20lb. Jim Berg has a really good long explanation on this in Windsor Power, if you do a search on him you should find it.
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