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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.
the casting number you are looking for that'll identify the era from witch the heads are from will probably be found on the bottom side of the heads on the rear of the lip of the underside of an intake runner...to access you may have to remove the intake and or head......if no number than what you state is found on the top side of the heads.....later model heads had the casting numbers located on the underside