clutch fork and pivot issues.
I had a truck A833OD \6 bellhousing that I used in my 68 Barracuda before I swapped in the v8. This bell housing also had the ball stud clutch fork set-up. The fork was about 1-2" longer from the pivot point to where the rod from the z-bar attached compared to the 3spd bellhousing's clutch fork that was in the car.
I used it and it worked fine. I needed to keep the clutch adjusted with less free play because you will get less travel in the pressure plate with the longer fork.