Have you pulled the rear seats and trim panels? Some vehicles, and I don't know about the older 'vert's, have the lower portions of the top held in by wooden pieces screws or bolted underneath, along with sharp prongs to catch the fabric on the sides.I'm in the process of putting quarters on my 67 Cuda vert. How do you take the top loose where it meets the quartes?
67 does as well.IDK about 67, but my 65 FSM gad the complete procedure for both the Dart and Coronet in it