Here is a disassembly video on the TRW pump from a big block that should fill in the missing pieces of the puzzle. Just for the record this is not me or anyone related to me but kudos to him for posting good content.
I’m going to attempt a rebuild of my pump. The 40 degree morning here in Missouri are starting to make my pump growl. Thanks for everyone posting what they know on the subject. As I don’t believe there is a cast iron water pump small block power steering swap for ‘67 and later cars. If I would have know I would have conveyed to a ‘70 and later timing cover and the matching radiator. When I was doing my engine swap. Should have a Saginaw swap option. Live and learn.