When changing to my new rims and tires the other day, I decided to check the rear hub nuts. Also took the opportunity to silicone all the rubber boots and check the brake pad thickness.
That sucker was on there good and tight. I took the nut off and applied some anti-seize on the nut threads and put it back on to between 200 and 220 lb/ft. Judging by the different position of where I had to pound in the new indentation (to hold the nut in place), I have no doubt that the original torque was at the proper amount and the hub was just fine. My car has never shown signs of this clicking noise. Im tending to think that this is not a common problem considering the number of total cars out there of this vintage and the number of reports seen.
Anyway, I'm now satisfied that those hub nuts are on there REALLY good and tight. Having done this and knowing what I now know, I am confident (at least hopeful) that the rear hubs and wheel bearings are in good shape.

 

I've got 60,000km on mine and they were also in spec.