my car only had a 7.25 and an 8 3/4 here is £1000 to 1500+ (uk sterling) and won't be A body width so needs narrowing anyway. i bought 2 explorer 8.8's (with a driveshaft) for £210 and got lsd, disc brakes and larger 31 spline axles all as stock. swapped a second 'short side' shaft into one and shortened the case myself. oh, and the handbrake needed only to weld the oblong 'loops' from the end of the explorer cable to the A body handbrake cable nipples to work.
