Power Steering Pumps???

I was wondering if a small block power steering pump and a big block power steering pump were interchangeable because they look very similar. Also if anyone knows does it matter what they come off of like I'm building an big block a-body so do I have to have a big block a-body power steering pump. Any advice would be greatly appreciated. Thanks

I don't think there is a differnce between the pumps. The pulley could be a different story though. If you have the correct brackets for the block throw it on and verify that the pulleys line up

Cool I'll check it out. Thanks a lot