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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.
with your mods i think you would be fine with a 75, however in my opinion that is on the higher side of fine, as in you would probably be better off with a 70, but you will see a difference with a 75. On a completely stock car though there is no reason to have an 80mm maf.