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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.
No. You can run the stock pump with 24s. My bro in laws car has stock pump and 24s, intake, cam, t-body, mass air, full exhaust +more runs 13.7s. If you start to use nitrous or supercharger you 100% need to upgrade. If you are looking to get a new pump then dont buy a stock one, upgrade to a bigger one.