8 3/4 '70 B-body to Abody

Bought a 70 Duster with a 69 charger rear in it. It fit well. The spring mounts
were moved in. But even the tires fit good. Had 15x7 wheels with 235/70s
on the back. My current 73 Duster has a early B body rear in it. Only 1 in.
wider than stock A body 8 3/4. I am able to put 15x8s on with 255/60-15s
tires. They have a 4 1/2 back spacing.