Vibration and Noise Issue

Lose that isolator crap.... You should have tossed that when you pulled it from the other car..

As long as you are within -4 degrees of the shafts angle you are ok..

Again angles are load related, 90% of the time..
Your shaft is in need of some attention.
There will be some minute amount of movement side to side, that is not uncommon


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.