Depends on your skill level.
An A body 8 3/4 or 8 1/4 obviously would be the easiest. Google mopar rear end widths there is a B body that's slightly wider.
Other then that your talking about narrowing or some custom rims to make it work.
Rear end cost can add up quick.
I have an 8 3/4 in my car with highway gears. I'd like to add a complete 3rd member with 3.91 and add large bolt pattern axles which will cost me about $2200 Canadian. Plus tires and rims.
Probably the best deal is a Ford 8.8 out of SUV can get cheap with posi, gears and disk brakes but have to shorten one axle though.
