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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.
Ive had both mac and bbk longtube headers on my gt-40p headed car, and they both bolt up and clear the plugs NO PROBLEM. If i were you, id buy BBK longtube headers (I prefer them over the macs) and use those.