Duster rear end compatibility

My experience was…
7 1/4 lasted a year behind a healthy 318/727 but I abused it large, like I was trying to break it!
In a 70 duster.
Chewed up the axle gears (spider gears) then spit them out.
I swapped an 8 3/4 from a 68 B body and its still in there. No clearance issues with stock rims. 15”rallies.
I previously swapped to LB pattern.
Only mod I did was replaced perches 1/2 “ inboard each side.
72 B 8 3/4 was too wide even for a duster/demon for me.
No issues after that.
Good luck whichever way you decide.