Hate to do it

Ok, I know I am going to get a few lumps for this but after all of that please hear me out and any ideas will be greatly appreciated. I am not allowed to spend thousands of dollars on a rear end for my 73 Swinger. Yes, I am married! So upgrading my 7 1/4 rear end with even and 8 1/4 sure grip is out of the question, getting one that is actually worth using, that is. Even finding just the housing for this is a few hundred dollars, then a few hundred more for the sure grip unit, then a few hundred more for brakes then a few hundred more for perch relocation if need be, you see how this is adding up? Yea, so does my wife. So, here goes, what rear end that is not a Mopar product will fit under my Dart? I can already feel the glares, but some of us are on a budget, so have a heart guys!