brake hardware from 7.25 to 8.75

I swapped a b-body 8-3/4 into a 71 duster a few years ago. I had an extra 7-1/4 rear from a 75 dart with 10" drums and nearly new brakes, so I just unbolted the backing plates with all brake components still attached and bolted them onto the 8-3/4 rear. Drums fit fine as well. So, yes it will work, or at least it worked in my case.