A833 fitment

After seeing the picture of the 2nd available transmission, I'd still go with the 64 since it's a virtually complete set-up. The conversion to a slip joint from the Ball and trunnion is in this article: http://www.earlycuda.org/tech/ujoint.htm I did not see a speedometer cable unique to the early A transmissions nor a flywheel; however it should be not too difficult to find them.