I’ve already stated that a DC rear shaft will work without relocating the spring perches. Plenty of 80’s are running the same as me and you will be hard pressed to find threads about moving the spring perches unless the owner went all out on a completely different suspension. The bow in the coil will be less than I think you are imagining.I can adjust the uppers more, yes. The lowers that I got are not adjustable (OME upper and lower arms)
At this point im thinking the next step is the DC shaft, I'm just looking to see if I can rotate the pinion up enough to make it work without relocating the spring seats and Panhard bar mount.