73 duster 7 1/4 to 8 3/4 swap question

Hey guys I'm stuck in a hole and can't get myself out of it have a few questions about my swap and trying to hurry to make the races in a few weeks so all advice is appreciated

I have an a body 8 3/4 rear end with 411 gears with 5x4.5 axles that were redrilled on small bolt pattern axles .... But I can't seem to find drums to fit the 8 3/4 with the re drilled axles... My question is my 7 1/4 has the large bolt pattern and was wondering if I could use the backing plates brakes and drums from there and install them in the 8 3/4.... Or if there is other solutions please let me know .... I also thought about drilling holes on the drums of the 8 3/4 to fit the large bOlt pattern again dOnt know Wat to do please help
You have to use the small bolt drums and plates and hardware and drill the drum to big bolt as well.
If you get dr diff axels you get big bolt pattern and can use b body drum brakes.