A body 8 3/4 or B body 8 3/4 ?

..'68 - '70 B body rear axle is wider by 3/4" per side or 1 1/2" total.
the spring perches should be re welded accordingly,but the shade tree technique would be just install the springs as is,it can be done
..converting sm bolt to larger A body disc brakes will widen the the front track about an inch per side..no big deal but some don't like the way it looks.