Using a mid 80's mustang rearend remove the old uca bushings and replace with spherical type bushings ( spherical bushings were used to correct the angle of the mounting ears). Get the ones with the 12mm bolt hole. You can use the ones with the 1/2" hole but you will have to bore the U bracket on the uca. Have to use lower control arms with rod type ends (connect the lca's to rearend and to frame this will help locate were to mount spring perches). Cut the spring perches off the 7.5 slowly jack the rearend up to meet the springs making sure rear is centered and tack them on the 8.8. Lower and weld completely. Now you can start mounting the uca brackets and arms (just follow his directions very well written). When it comes to boring the 1/2" hole for the bottom bolt I used a pair of vise grips to hold the bracket tight against the frame. Something that may help is after the spring perches have been welded and checked remove springs this will make it easy to reach the top bolts on the uca's. You may have to shorten the threaded part on the uca to get the pinion angle you want. The brake line off the 7.5 will bolt up to the 8.8 wheel cylinders just strech it to fit. I don't know if this will work with disk brakes but will for drum brakes. Replace the pinion yoke with one from strange or moser for the 1350 u-joint can use same drive shaft. I deleted the parking brake so you are on your own on that. Here are a few pictures for my project.
Bucket bolted in.
Clamped down.
Finished install.
Side view finished.
My new low rider.
Bucket bolted in.
Clamped down.
Finished install.
Side view finished.
My new low rider.