Tuning the ECU would really be the answer, but I don't know what's available to the OBD2 LT1 crowd these days. Fine tuning the injector duty cycle is really the proper way to do it, and then you won't need a FPR at all. If you need higher flow, get bigger injectors and trim back the part throttle and idle duty cycle. Or, keep the stock injectors, get a FPR, and trim back the duty cycle to compensate for the higher volume from the FPR. You're not talking about a rising rate regulator, are you? I hate those things..