Pinion Angel?

Yes, otherwise the joint on the pinion will gall and fail, when the grease fails to circulate. One degree works well.

 

This may help you. I downloaded it years ago and use it as a guide. So far, no problems.
Normbc9

 

#4 can be made to work. That is the "broken-back" configuration. It can be found in Land Rovers, where it works just fine:

 

Good info. And timely, just getting ready to set my rear and motor in the studebaker pickup this week. Thank you all for the great discussion.