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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.
It is probably leaking through the quarter windows, the back window, or along the seams. Do what Mattdel said get in and hose her down. But Verts should not be left in the rain for long periods of time. No matter what ya do new top or not these old cars leak a lil.