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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.
Nitrous?? What kind of budget are you working with?
+1 on nitrous. If you want constant power id say port your heads and intake and get a more agressive cam(assuming its not a DD). Nitrous will get you the fastest the cheapest though.