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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.
When you buy the new MAF just make sure it is calibrated for your stock (19 lb) injectors...If you are planning on getting larger injectors then get one calibrated for the correct size.
That all depends on what you plan on doing with your ride. If its for street racing/daily driver then 19lb injecters are fine. 24lb is a good upgrade from 19lb, but thats only if you need more power from your car and got the money.