Who has put a B-body 8.75 under their 70 dart?

Put one under my 73 and used the early 2000's mustang bull it wheels 5.7 inch backspace IIRC. Use 245/45/17 rubber. I did move the perches. If I pull onto an uneven surface and the rear end twists, my tires rub the inner wheel lips just a scoche. Wheel vintiques also Stockton wheel can help. Member 72blunblu, ( I hope I got that right) knows this like the back of his hand. He helped me tremendously! Over all I'm glad I did. It is what exactly what I wanted.