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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.
I ran 11-1 with a 250 shot and it was great.
I know of people spraying a 400 shot on a 15-1 compression motor.
but if you want to run pump gas still with the spray IMO I wouldnt go any higher than 11-1.