8 3/4 pinion angle

It's fairly easy to mock it up in the car and get it pretty close with literally no special tools at all. Get it a few feet up in the air with the weight on the suspension and the perches in place, but not welded yet.

Then find a couple broomsticks or similar sized lengths of pipe or whatever, it doesn't matter. sleeve them a little if necessary to fit snugly in the trans and pinion yokes where the U-Joint is normally installed.

Let them hang straight down, walk away from it about twenty feet or so and see where they point. Parallel is where it should be under load. Get it there, then move the pinion down however many more degrees you want, depending on your suspension setup. Tack the perches, take everything apart, finish welding and you're done with your pinion angle setup - If you got it right..