[83hurstguy]

The most obvious issue would be leaking fluid. Other than that, you can try to spin the fan with the clutch stationary, and the fan should &quot;drag&quot; and not spin more than 1/4-1/2 revolution. If it freewheels, it won't be spinning under load. Of course, the final test is keeping the car cool at idle. You should be able to give it a quick spin test without worrying about ruining the &quot;barn find&quot; patina for MCACN. [img]<<GRAEMLIN_URL>>/smile.gif[/img]

The AC Delco HD clutch is 15-40108, found it. If your clutch is good, I'd be inclined to run it, use this number as a backup or if it wants to run hot at idle.