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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.
If your MAF is stock and already calibrated to 19#'ers you will not need to have it recalibrated for any 19#'ers you put in it. If you put in upgraded injectors like 24's or 30's you will need either a new MAF or your stock one recalibrated. I hope i answered your question.