I bought a cheapo haden at the local part store for less than 30.00. Standard duty for my BBC. Keeps my engine cool just fine and I live in south Texas.
Be careful which pilot shaft you get!!! 454 water pumps come in 1/2 inch or 5/8 shafts. You will have balance problems if you install a 5/8 shaft clutch on a 1/2 shaft water pump.