Clutch Fan Info

Brooks James said
I shopping for a thermal clutch and fan for my 70 Dart (warmed over 360 magnum about 370 hp, no ac, no pb, ps, 3500 converter with a huge trans cooler in front of the radiator)

Ive got a 27 inch plus, 2 core aluminum radiator, a hi vol water pump, an ac water pump pulley for extra pump rpm s
no shroud yet

the distance from the tip of the water pump shaft to the radiator is just over 3 in

my question is, how close do I want to the fan to the radiator ?
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I’m not sure what clutch fan I ran in my ‘69 440 ‘cuda but it couldn’t be more than 1/4 to 3/8”. I’d have to loosen the stock fan shroud and push it back. Then I put a piece of cardboard between the radiator core and the clutch fan. I would then unbolt the clutch fan (blade attached) from the water pump and remove it along with the fan shroud at the same time. It was close for sure.