Quote: A thermal clutch fan is a belt driven fan mounted on the water pump. It has a thermal clutch that engages the fan when hot and disengages when cool. Mancini sells them. Pic attached.
That's the one. Works great for me. It will need a shroud - it may be possible to adapt the shroud from the original radiator or you'll have to get one made.
I do agree with previous posts on checking timing and idle mixture first. Too little advance or a lean idle can make it run hotter.
