Thanks guys. I actually have a pump that came up in the local parts stores catalog as a 62 chevy pump, however it looks like the attached image on the back. Pump fits tight in the bracket pictured in the above links so the indent on the right lower portion around the attachment bolt does not allow it to pivot. I dont have the pump with the smooth back so nothing to interchange. I am wondering if anyone might have one with the same smooth case, if they do, possibly a casting number might lead me in the right direction.
[IMG]http://i64.photobucket.com/albums/h168/lowrider62/pump/pump1_zps71191d6e.jpg[/IMG]