Pros and cons of using a B-body rear axle assembly???

I actually used an E body unit (1970 Challenger) in my 1965 four-door Valiant. Made a deal with a fellow Mopar enthusiast to trade an extra A833 four-speed I had in exchange for him flaring out my rear wheel wells. Aesthetically probably not what everyone wants, but in my particular case I think it improved the look of the '65 Valiant (with 4.56 gears it managed a 12.72 @ 108 MPH with the 273 back in the 1970's).