I have never checked to prove it but I suspect that "hot" on our SD gauges is likely not much more than 200 degrees. I think our cars originally were built with 160 stats.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Hot on mine was just over 110 which is not to bad if not for too long when my radiator sprung a leak my gauge when all the way to "H" then continued right around to almost "H" again...
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Surrey BC
1963 Acadian Beaumont Sport Deluxe http://www.63acadian.com/