pump and pulley question

You could save yourself a whole lot of headache by replacing pump, pulley, and bracket(s). There are/were just too many variations in all of it.
Once upon a time a member here was seeking a pulley and provided most of the dimensions so we both thought the pulley I had was the correct one. After in his hands, turns out the backside of the center hub was a tad too long ( The one characteristic not checked ).
Both of my 67 273s have the oval neck Saginaw pump. Good luck