IIRC,there is a early ferd rustang/mavrick 8" maybe a 9" rear hosing that bolts in an A-body.

may or may not have to move spring perches

I have been looking at some of the jeep cherokee rear axles,the one my son has has the same 43" spring perch centers as a-bodys,not sure it would hold up to a BB or hemi but disc brakes maybe a plus.

with my 68 Dart,I got tired of looking and just had a c-body 8 3/4 cut down to a-body specs and got a set of large brake 5 on 4.5 wbp axle from moser.

then it bolted right in my 88 440 truck and tucks 12s with 29x15x15 M/Ts in the fenders

good luck ferd hunting