Stock is stock, but when modified every combination is different. I strongly recommend that you mock up the rear end in the car; you can just snug the U-bolts, put weight on the rear using stands at the same height as tires and use a floor jack at the front of the rear to adjust the angle, then tack or mark the perches in place. Pull the rear and bring it to someone with a BF welder to finish it (I brought our Dana to a metal-works shop all prepped and they welded it for free).