I'm not sure what the numbers are, but you should be a couple degrees down on the pinion compared to the t-case end to figure in axle wrap. I have no idea what mine is, I'm just working things so they work and not go into a bind anywhere. I might check angles when I'm done. Don't want numbers to scare me or throw me off.
I did move the trans crossmember back a couple inches then drilled new holes in the rails for it. Also used a small holesaw on the side so I could drop bolts in.