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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.
For what mods that you already have, the 70 isn't TOO bad but the 75mm is way over kill. If I were you I'd go with a 65mm TB, perfect size for a stock or bolt on 5.0.