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I have been watching this post now for the past couple of days and have yet to have anyone who has responded here to validate if, "1/4 of an inch separation" between the clutch fan and the radiator core is an acceptable distance. I am having a similar situation with my build...383 non A/C with an aftermarket aluminum Champion/American radiator. I am using the Jaguar clutch from Napa as it has the shortest shaft length of any out there, a 7 blade MoPar fan, without a fan shroud at present. It would be nice if someone here could validate that that distance will work properly. A simple yes or no would suffice without all the additional rhetoric. Please try to stay on point...

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I designed and engineered fan & clutch products for several years. We typically used a design guideline of 1" for fan blade to radiator core clearance. You can likely get a way with a bit less. I would not recommend to run a fan with 1/4" clearance to anything in an engine compartment. Also, make sure you use a fan shroud with approximatley 1" tip clearance and 50% or so fan depth covered by the shroud. If you don't your cooling efficiency will be very poor.