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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.
<~ recommends using a hardened oil pump driveshaft when installing a new pump in a small block ford. those like to twist, especially if you run a HV or HP pump. they are less than 20 bucks too, so its cheap insurance.
rule of thumb is if your rebuilding a stock or slightly modified 302 the two most important things to upgrade is the oil driveshaft and the 5/16 rod bolts (to stronger 5/16 rod bolts, not going bigger to a 3/8 bolt)