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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.
You need to buy a MAF caliberated to your injectors or have it tuned and a chip made to make your setup work, best option without a tune would be aftermarket.....look at summit. Then when you are ready to upgrade(you are already) buy a new matched set(or just do it now...like Adder said and use the LMAF)