B body 8 3/4 into an A

Well, from what I have now is a 65 B-body 8 3/4. It will bolt up with a little help. the perch on the b bod is a little farther apart. but you can pull the springs in just a tad to get them to bolt up. Not sure how the side to side movement will be once you do that. I have not had mine on the road yet. As for wheels. I have 7" wide cop wheels with I think 4.5" back space. With the measurements I took I think I need a 5" bs. or I am hoping that I can trim the lip enough to clear the tires. Now I have 215/ 60.