Info on 7.25 to 8.75 backing plate swap
Or you could use the 7.25 plates on the 8 3/4 with if you were going to BBP axles and the large shoe offset anway.
The bigger brakes MIGHT have a tendency to lock up on you quicker.
http://www.forabodiesonly.com/mopar/showthread.php?t=26201&highlight=brake
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