Early 64/65 A833 to later gear conversion?

tomswheels said
So no way to modify my tail shaft housing to slip yoke?

Sure there is. See this link: http://www.earlycuda.org/tech/ujoint.htm That gives you the best of both worlds: a slip joint yoke AND a beefy ball bearing tailshaft. I'm planning on doing the same thing to my 65 833 that's going in my 65 Dart wagon.