spring relocation inboard help

I've got 275/60/15's on my 68 Dart. All I did was move the front hanger against the frame and moved the shackle bracket and the spring perches to match. It was about 5/8" on each side. I have not rolled the lips either. It's a tight fit, but nothing rubs. I'm not sure how different the rear wheel tubs are between the 68 and 72 though.
man i would be tickled if i could do the same as you and get the 275 in there with no rubbing! Maybe someone that know will chime in on if there is any difference between the '68 and '72 wheel tubs..can you post a pic of yours so i can see how it looks?