69 dart springs relocated wheel backspace?

I am going to run a 275 on a 8 inch wide wheel in my Dart. Sorry don't know what the BS would be as I have not done it yet. There are a few members here that rare running that set up. It is a little tight but they do fit from what I have seen. I am sure some one will chime in who has that set up. It rely depends on your axle langth and factory tolerances in the wheel well area. What works for one car may not for another and the same goes for side to side as well. One well may have more room than the other even on the same car. The best thing to do is measure your wheel wells and see what you have to work with.