Rear Axle, Which Method for Bolt Pattern Conversion...

Hello! I have a 71 Valiant with 7.25 rear, SBP. I've recently put disc brakes, in BBP, on the front, which resulted in needed to carry two spares. It's the 73-76 style brakes, so I could not use 14" SBP wheels, and wanted to keep look of the 14" hubcaps...anyway.

So my question is, should I go hunting for a BBP 8.25, or would it be acceptable to have the existing 7.25 modified? It's a /6 daily car, so it's not making big power.

If I do have to use the 8.25, how difficult would it be to find it in 2.76? That's what the 7.25 has, assuming it's not been swapped, which I don't find likely with a 7.25.