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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.
That could the the reason. Sounds like the timing cover is different. Have him check on the block to see what year his block is. The stamp is above the starter.