Another Factory A-Body Dana 60 width

I'm sorry to ask this because I know it has been asked before and I am just too lame to find it in a search (but I did try).
I need to get a Dana 60 for my '69 Dart GT, and I need to know the factory width and if there is any difference needed in width if mini-tubbed?
This is the last major piece I need to get up and running.
Thanks.