Thanks again for your help guys (and gals?) - have the water pump going now, am on to the fan.
I found (here, and in Jerry's book) that the car would have been equipped with an 18", 5-blade, 4-rivet fan, with 3.25" diameter bolt spacing where it mounts to the fan clutch.
I found a replacement 3.25" fan clutch. I haven't been able to find any kind of replacement fan to fit it. Bought the nicest looking new 5-blade fan I could find, and it's clearly for the 3" diameter fan clutch mount.
Does anybody make a replacement fan that will fit my 3.25" diameter fan clutch? Or would I be better off finding a 3" clutch for my 5 blade fan?
Trying to be as technically correct as possible, without spending $xxxx on original eBay stuff. As long as the parts I use are no higher performing than stock, I should be OK.