Steve,
 
69-70 big block shrouds are all the same if that is what you need and they are readily available.  Stock water pumps work good for mild street motors, but if it is anything making any kind of significant horsepower, get an aluminum pump.  I have a Weiand on my 70 along with a 7 blade clutch fan.  On normal driving, it stays around 190 degrees.  For an A/C car, get a heavy duty clutch for the fan, it will pull more air through the radiator.
 
Tom

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