Vibration and Noise Issue

Also, from the best I could determine with my angle finder, the transmission is currently sitting down 2 degrees and the pinion is about 4 degrees up. The problem I have is that I have F body springs in the car complete with the spring isolation setup. Does anyone make shims for these? The center hole on the perch is something like 1 5/8 inches big. I could possibly just take out the rubber spacers and put in solid wedges in their place, but I'm not terribly fond of the idea right now.

I guess I should clarify that this is with weight on the axle. The car may have also been at a slight angle (sitting on a driveway), but that should cancel out of both measurements right? What should this angle be? From what I could gather at Moparts tech archives I should shoot for around zero difference between the two to maybe a degree or two low on the rear?