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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.
Total timing will be determined by the engine setup itself...... it's not a given number that you should use. To find out what setting will work better, you need to test it, and use ET as your guide, start with 36 total, test, change to 38, test....etc, etc.... until you obtain the best performance.... and make sure no engine knock is present.