Pinion Angle

I believe the procedure is to put the driveshaft in, and measure the angle of the driveshaft. Then measure the angle of the rear end pinion and the pinion should be 5 degrees nose-down vs the driveshaft.

On my car, I just bolted the rear end in place with the perches "loose". Then I set the side-to-side location relative to the car body. Then I put the driveshaft in and let the car down to measure angles. Once set, we tacked the perches, remove the rear end and blazed them on.

With no drive shaft, you could wait until you have one, or you might be able to use a long 2x4 or something to simulate a driveshaft, and read the angle on it. That'd be a 2 man job though.