Why use a passenger side water pump housing?

I put a passenger side water pump housing inlet on my 400 going in my 64 Valiant because the radiator outlet is on the passenger side. It even looks like the stock slant six bottom hose will fit the big block. The timing marks are very easy to overcome. Just paint a mark on the water pump housing inlet in lone with the zero mark on the timing tab. Now you have a reference that's easily seen.