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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.
That would be a problem, but not necessarialy rings, could be a bad head gasket, valve and so on, but it would only be like that mostlikely if you car was running bad now...I would be suprised if you saw that big of a difference. I think if you are within 10% you will be fine, change your seals and springs and drive it untill you rebuild.