A833 In Truck
The truck ball stud looks like this (this would fit bellhousing 3515734):
The 1968-'71 A-body ball stud looks like this:
The '72-up A-body ball stud looks like this:
Photos courtesy of Brewer's Performance
On the two A-body brackets, note the difference in the ball's location relative to the bolt holes. The body-side ball didn't move between years; the difference is in the bellhousing, specifically the mounting pattern for the ball stud. Basd on the wraparound design of the truck part, I don't think it would work with the '69 bellhousing's countershaft configuration.