Why not simply use the Grand Cherokee or Dodge Dakota disc brakes on the rear?
They bolt right on the 8.25.
About the only thing different is you will need longer wheel studs because the discs take up a bit more room than the drums.
I put them on the 8.25 in my Dart.
Thanks, I knew that was one option from the searching I've done. I'm happy, at least for now, with the 10" drums since I've already rebuilt them and they work great.