[lintmann]

I'm looking for a correct rear end for my 65 and was wondering if someone could help me out with how to ID a real one. I did a search but I'm still a little confused. As per the PHS it should have an open 3:55 but I realize that finding that code with the correct date code might be asking too much so if I can just get a properly dated one I'll be happy for now.
I understand that the correct casting code is 9779822 but that this casting could also be used on other GM cars so what are some obvious visual clues for the 65 A body rear end? Also what is the date code format, I've heard that is could be Julian or M/D/Y? Where is it located, I thought it was on the back side lower right but from what I've read it's on the front or bottom?
If someone could post some pics that would really help me too.
Thanks guys!