Belt numbers (or sizes) for 1969 427/390HP Big Block Corvette

Can anyone tell me what belts are definitively for this car? Its a 1969 Corvette w/ 427 Big Block, 390 HP. Stock.

The 3 belts that are on it now are too large and the 4th one (water pump to crank) is missing, causing a terrible squeal as soon as engine RPMs exceed 3000.

I tried ordering a set of belts from a Corvette parts catalog and they were bigger than whats on there now. I'm also missing the water pump to crank belt completely and want to ensure I have the correct size before undergoing the job of changing these. Part numbers of common brands (dayco, napa, gates) or sizes would be much appreciated. I can't seem to find much info about these belts anywhere.

Also, does anyone know if its normal for the fan to sound like a small jet engine when the RPM is above 1500? The clutch is not seized...but it never seems to freewheel even when the engine is cold, warming up, or at temp. Fan always screams and seems like its moving gale force winds at all time. Could the missing belt be causing this behavior?

Thanks!!

Lee

Belt numbers (or sizes) for 1969 427/390HP Big Block Corvette