1973 Scamp Rearend question

Some people have taken a B-body rear and used in an A-body. They are wider but you can get rims with deeper back spacing. 62-70 B's have a 44" spring perch versa the A-body 43". Some people just pull the springs in and both them in but I myself would weld on new perches. But to answer your question the a-body is the narrowest rear housing.
I have a 9.25 rear from a 2000 Dakota that I'm going to measure just to see where it is but it has 6 lug axles which would need to be changed.