64 Valiant Clutch Linkage

had a issue like that with my first Dart. I put a "shock extension" on it. I'll hafta look for a picture but it had about 2" of hex with internal threads and 3" or so of threaded stud. worked fine with a Hays S/S gold 3-finger pressure plate.
I'm thinking the threaded part is too short. That's the piece that attaches to the Z bar.