Wheel to spring clearance

The only way they will fit is moving the springs into the frame and have lots of backspacing!!! I've never been able to use a wheel wider than 7 inches in the back of my 70 Dart Custom and still have enough room not to cut the sidewall when the car is loaded to the side in a tight turn. I tried 8s and cut up the inside sidewall on the clamps on the springs.