I run a '62 261 in my '50 pickup with a 2000 CFM electric fan and thermostatic switch. The switch is adjustable and senses the radiator temperature. It works well, but the fan draws 15 amps so you need to run an alternator. If you haven't done so already, you can shorten the water pump shaft and use a shallower pulley. I use a 7" pulley from a Ford pickup that fits perfectly. I could run a mechanical fan but the water pump sits too low on the radiator and the electric fits well.
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1950 Chevy pickup with '62 261, 4 speed.
