Centering new rearend ?

I have a newly resized 8 3/4 that still needs to have perches welded on.

Besides pinion angle is there a proper way to center the housing relative to the driveshaft vs springs vs frame ? Were they offset or centered from the factory ?

I've done a search and find nothing related to this.

I am having a driveline shop do the final install but I need to drive it over there (gently) ... But am mostly curious .