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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.
definately go 255, if you plan on modding your car in the future it cant hurt. You can't go too big and you dont want to drop the tank and spend atleast another 100 bucks on another one when yours is perfectly fine just because you didnt buy a big enough one to begin with