Just an update.
First, the 560 fan clutch I found with the cover is bad. It has some play in the bearing. Not much, but I can't trust it. The cover won't fit on the Behr fan clutch so that is out.
I can't find a lower temperature thermostat that is made like the generation 1 126 V8's.
I found a 160 deg Stant thermostat that they say will work. I found one, installed it and the car ran hot. Took it out, put in a pan of water on the stove and it started opening at about 175 deg. I also put the old 183 deg thermostat in the water. It started opening at about 183. I let the temperature go up to 200 deg and the original thermostat was open about 2 times more than the Stant 160. That explained to me why the engine overheated with the stant. By the way, the Stant was made in China. That explains it even more.
I have watched the temperature of the engine closely and it runs between 190 and 196 (I have a digital temperature gage add on) when the outside temperature is between 70 and 85, A/c on or off, idling at a light, 70 mph on the interstate, up hill, down hill, etc. At 70 mph on the interstate sometimes the fan clutch will be on and other times it will be off. There doesn't seem to be a pattern. At anything less than 60 mph I can't tell if it is on or off as it doesn't make the roaring noise.
My only option now is to wait until I can locate a used fan clutch that works or can be fixed. Buying new from the dealer is not an option at this time.
Does anyone have any other ideas?
Thanks for letting me vent.

Paul

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84 500 SEL (307,xxx miles)