Back in the day I shoehorned a Toyota engine into a Spitfire. Even with relocating the radiator forward there was no room between it and the water pump for a fan, mechanical or electric. I found some random junkyard e-fan (there weren't many to choose from back then!) from a Simca I think, and after some mods to the blade so I could mount it backwards on the motor, I then mounted the fan assembly to the front of the radiator. I just used manual control; off til temp gauge moved, then on. Worked good.
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