I got the rear end all cleaned up and back together with the de-arched springs. Lets hope it sits nicely now. Thanks to FormulaBruce from the Performanceyears website for all the parts he supplied, including a T-bolt for the spring perch, the nicer set of front spring buckets and the rear shackles (I did have to use my original shackle through-bolts as the ones that came with his set were about 1" shorter and didn't have enough thread to clear the rubber bushings. I still have a bunch of correct bolts and brackets and thingies that he has sent that are awaiting the car's return.
Here is the rear and the driveshaft (that I repainted using the same ID stripe pattern that was on my 72 T/A's driveshaft)