will a caprice or impala rear end work on a square body suburban?

found a 9c1 rear end complete for $250.  Gavin called last night and said he thought the tires would rub on the stock xle, so 2" narrower will be perfect. here is where i got my info: http://www.crankshaftcoalition.com/wiki/Wheelbase,_track_width,_and_differential_measurements rear track width (backing plate to backing plate): 91-96 caprice  60.7"73-87 suburban  62.7"