Found cause of noise rear brake noise problem after quite a bit of experimentation. The new drums I bought from Moss are machined incorrectly. The recess inside the drum, where the hub mates, is 1/32" too deep. When installed on the car this caused the end of the drum to hit the back plates! When I first had the noise I compared the new drum to old ones, on my workbench, and everything appeared to be the same. I had even compared this hub mating surface, but not closely. I had no idea 1/32" could make that difference on a drum brake (I can barely read a rule that fine without my glasses, I guess time for reading spec's!). I was focusing on one side and finally figured out the noise was coming from both sides. Put both old drums back on and problem gone. I will be calling Moss this morning to see what they have to say.