I need the round hole style so I checked the ATP Y156. It doesn't list a 383 Dart as being one of the applications for it. This is why I was wondering how the measurements posted are taken. Plus, 19.5" is still a little too long unless there is some way of mounting the cable to accommodate the extra length.
They don't list anything that old in their catalog. I dug onto my 69 parts manual, the pn for a 69 Dart with a 4bbl 383 is 2899337
https://www.moparmall.com/MoPar-PN-2899337-Throttle-Cable-p/808-398.htm
