I have one in my 68 Barracuda, been there for 10 years and 65k miles.
The only issue with the long tail shaft A833 in an A body (besides a shorter drive shaft) is neither shifter mounting pad is in the correct place to have the shifter come through the floor in the a-body position. It's easy enough to deal with by making a mounting plate that bolts to the rear E body position and places the shifter forward to the a-body position.
The front mount can't be used because it is partially under the crossmember.