You want the fan as close to the radiator as practical for good airflow.
Spacer benefits are cheap price and less mass.
Space downside is that it's spinning the fan full-time, sucking up a few HP.
Clutch benefits are variable operation, the silicon fluid only engages it to spin when it's hot.
Clutch downsides are cost and mass.
I'd switch to an electric fan.
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1982 Z28 w/ '01 LS1 + T56, TR224 cam, Katech oil pump, JWIS chain
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