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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 you have exhaust or other bolt-ons, I would go w/ the 24#ers. 300rwhp is pushing the limits of 19's and you will not be too far off of that (depending on current mods).