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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 would guess timing also...set it between 10 and 14...base timing with spout out is 10 so maybe go from there. Also check you plug wires and make sure they are all plugged in.