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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.
No, your 99 is a modular motor. they won't fit the same. buy a used on in the classifieds or on ebay. Also, no need to change your TB if your MAF is still stock...you'll just lose air velocity.