Ok, got the yoke done, here's the run down in what I did.....
This is the stock 1350, 14 bolt yoke and u bolts I started with
Started off my measuring the bolt spread on the U bolts I had and found that they were the same, center to center as the tapped holes on the yoke. So I drilled them out to a 13/32 to clear the 3/8" u bolt.
Next I machined off the face roughly .225" so the u bolt could clamp on the u joint
Next I machined a flat on the back so the nut had an area to rest flat on. I made the thickness about .950" so the threads stuck out far enough to engage on the nut. I also used a cutter with a radius on the edge to help keep some strength in the yoke.
And the finished yoke
I had about 25 min into it, easy to do with the proper equipment.