If you go with a panhard bar / watts link and a torque arm bolted from rear differential to the rear of the tranny area (parallel to drive haft), you can do away with the upper control arms all together and have a much much better rear susp setup.
Over a little more than a year, the springs have settled a bit. I was at 27 1/8" at all four corners, but have lowered another 1/4 inch or so, with a little more in the rear. I am just about to tweak up my rear ride height a bit -- it is so cool having adjustable rear LCA's...