I know how it's NORMALLY done. Cambered snouts. The ends of the rear end are cut off, and cambered snouts are welded in place. Then full floating axles are used along with drive plates. This is normally done on 9" Fords
see attached link.
It has been done on 8.8's by placing the rear end in a fixture and bending the housing. This places the axle in a bind and will cause premature axle bearing failure. It seems really suspect to me. A lot comes into play. For instance, when running a cambered rear end, changing the pinion angle can also change the rear toe setting. Bending the rear end housing improperly without considering the "toe" factor can make a car that is completely unpredictable and dangerous. Unless you know a reputable shop to do it, it's not a modification for a shade-tree mechanic, IMHO. Regardless, unless you go with a rearend with properly cambered snouts, I wouldn't recommend it. Others on this site may disagree.