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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.
If one were to port one area or another of either the in or ex, the biggest increase in flow is typically achieved by properly porting the bowl, blending the valve guide and doing a 3 angle valve job.