64 Dart Gt 4 speed won’t shift into gear ??

I had the same problem with my 64 dart 4-speed and found that where the z-bar ball stud connects to the frame of the car the frame had a crack and when pushing in the clutch the frame crack would flex not letting the clutch dis-engage I had someone push the clutch in and watched it flex I had a plate welded on the outer side of the frame and where it had fatigued then it was ok the car was rust free from Ca.