Thanks BulletBob for the info !

Well , looks like Borgeson does not offer a universal to fit a 13/16"-32spline input. They did have a 13/16"-36 spline. Maybe the Mopar steering box switched to 36 spline after 1979 ??
Heck the factory manual just calls it a " 708 Style " with no dimesions listed. I assume it is a Saginaw make/design although it is never stated as such. Though the factory manual does call the Steering Pump a "saginaw 94".
I forsee having to get a steering shaft with one end flanged for the rag joint to make this work.......