What is the correct fan to radiator clearance?

Mattax said
Spacer depths for non-clutch fans depended on blade width.
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Should be room for a correct thermal drive clutch that is the same dimensions as a the factory unit.
Problems come when using the water pumps with the longer snout. But even then with the correct radiator there is room. With a later square top radiator, what I did was resolder the side mounts so the top tank was as far forward as possible. That gave enough room for the MP clutch and 5 blade fan. What your doing is better. Practically the same as factory. (And since then I've changed to a correct type radiator with 70 bottom tank).

I like your thinking for your issue. Have not heard that approach before but whatever works.

What I did was order a factory spec fan clutch, Hayden 2747, to replace the low profile clutch I have just as you commented on. Your spec sheet is very interesting and has my radiator listed for manual transmission. Cost a bundle. Shroud I have forget where it came from but got it to match radiator. My fan 2863215 not sure what the pitch is. Worked hard not to have a clearance issue. Looks like I worked too hard. New clutch should improve things. I could even shim the radiator closer if need be. Seems like everyone else is going the other way. Did not want to connect and fill just to find out I have a cooling issue. Read many a post on cooling troubles. Thanks for all your input and spec sheet.