/// I thought of something else. I pulled a standard trans from a 1980 and put in a auto. When I compared the clutch cable later to a 1983 there had been design changes. Maybe there were changes in your clutch cable that limit the adujustment range.

In 1980 the whole metal line had a ridge that spiraled and functioned as the thread for the adjuster. (An almost unlimited adjustment range.) By 1983 the adjustment range was limited to the length of the nylon collar at the ring on the frame.

I don't have the experience to call up the details of the 72 from memory. My 72 is an auto 1800 and my 68 (wreck) is sitting low to the ground. In the current weather here I can't get to the clutch to examine it.

If it warms up and clears off I can shoot pictures of the 68 for you keep the email address.