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Thanks for the input all. You've confirmed what I thought I already knew but put it in a context that made it clear. I had concerns about the hot spots but it never occured that the pump could cavitate. I've ordered a 180 degree military style thermostat and a NOS winter front from John Bizal...

I have concerns about a thermostat we installed in my M37 today. I swapped the existing, stock 180 degree thermostat for a 195 degree unit because the engine wasn't heating up and I was about to freeze my "whatever" off. As you may know, the M37 has a by-pass on the top of the water pump...