Rearend width's

Just thought i would throw the question out there. I just have the 7 1/4 rear now and want to get a 8 3/4, but the a-body rears require a arm and a leg. I figured it would be cheaper to find a b-body rear and have it cut down. Just not sure how much. The only problem that i see with running alot of backspacing is that i have read about people having a hard time getting the wheels off the car and that it would be easier with something like 3.5 inch backspacing.