[601HP]

I've had a Spal fan integrated with my aluminum radiator and 427 s.o. for several years. I use the Painless Fan-Thom relay with electric thermostat, part #30103. The turn-on temp is 185 degrees, the turn-off temp is 170.

Try that one. Painless offers several other temp on /temp off electric thermostats if you decide you want a different range. Their website posts good descriptions and pictures of this set-up.

David