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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.
4-cyl cars have 7.5 rear ends that will not tolarate the abuse of a BBF. You need to look into trans upgrade, 8.8 rears will take a good pounding and keep on going. They will support up to the 550-600hp range. special headers will be needed and a special bell housing for the trans