IMO,
Sell the factory A body rear. Grab a cheaper B,C,E or truck/van rear and shorten it. If you have axles and SBP brakes for the A rear it's worth a bit of cash to someone that wants a factory piece.
Get the wheels and tire you want measure BEFORE you shorten the housing. BTDT and had to put spacers or run a different wheel because backspace wasn't correct.
