8.25 Vs 8.75

Howdy again peeps!

Another question.


I'm narrowing my b body 8.75 to abody width.

The b body 8.75 has no brakes jist big bolt halfshafts

obviously the b body halfshafts won't fit once it's narrowed but I have 8.75 half shafts in small bolt pattern a body form to use as I want to keep my SBP wheels.

I also have a complete a body 8.25 that's big bolt battern

Can I use the a body 8.25 backing plate on a 8.75 that WAS big bolt but now.small bolt?

Or does bolt patterns etc not even come into play?