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