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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.
your compression is border line.....bare min needed for combustion is 100 psi, do you notice a loss of coolant,??? I'd monitor coolant level and if you have a pressure tester pump the system up and look for leaks or a drop on the gauge and pull plugs on that side and if pressure on gauge drops and no external leaks are visible see id the cyl's fill with coolant.