Big block water pump where to find long neck?

Im trying to find out where I can find a rebuilt long neck water pump? I have a couple of cores off parts motors that are the heavy duty long neck version but they are cores.I've went to four different parts stores and I've only been able to get the short neck standard duty version. Where do I go to get a reman long neck version or where can I go to get one of my cores redone?

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What application is the long neck pump used ?

I don't think there's any difference in the overall length of BB pumps but the large bearing pumps give the illusion of being shorter than the small bearing pumps.

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What application is the long neck pump used ?

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Big block severe duty use. Imperials, trucks, cars with ac, and race hemi cars.