What is the correct fan to radiator clearance?

70 340 installed in 68 Barracuda. Installed 68 water pump and low profile Hayden fan clutch. Distance between fan and radiator is 2 3/8 inches. Radiator side of fan is at shroud opening meaning not below outside edge of shroud. Have opportunity at this point before I continue is to install sock Hayden fan clutch to move fan closer to radiator. What do you guys think?

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