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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
The stock 88 LHP pump is holding you back big time. Stick a 255 LPH with a adjustable regulator and set the preassure between 38-42 (no vac.) and you will see a considirable diff. in the way the car runs.
What does the car run now with fuel system the way it is?
Please don't ever give fuel pressure info... 30# injectors at 40psi is ALOT of fuel...If it was stock 19# injectors I would say yes, thats a good starting point, 38-42. Not with 30's tho, it would run real richset that high.