OK, I'm going to have to say it again - because I see a pattern developing here.
EVERYONE I have ever personally known with a classic car overheating problem seems to have experimented with electric fans and found relief finally by going back to a good 'ol HD clutch fan and shroud that the factory designed for their car for A/C or HD cooling applications. This has crossed different makes AND models of cars, too.
I have seen this enough times that I would never consider electric fans as a potential solution. I just do not see how 12 Volt electric fans can come close to pulling the CFM of air like a belt driven metal fan.
Agreed, as far as the previous question about thermostat temp rating, if you have a 160 degree stat, it will initially open and then more than likely never close(hot climates)therefore the coolant is not spending enough quality time with the radiator to transfer the heat from the engine to the atmosphere...get it? got it? good