PS Pump for 273 small block, what will fit?

Thanks for the help!

Just to make things clearer, I do not have a pump or brackets , the pump in the first picture is the original pump for my 65 273 engine, but the previous owner needed it. So I took a picture of it too have somthing to look at when I try to find another pump that will match.

I do have a federal pump from my old slant six enginge, but I can only find brackets that will make it fit on a small block with aluminum water pump. And from your posts I understand that is not the case with my 65 enginge, right?

So if I understand correctly, pumps from small blocks from 70 and up wont fit my old engine?