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

I am fairly certain that the small bolt 8 3/4 drums have a much smaller pilot diameter and cannot be used on large bolt pattern axles for that reason. When I put together the 8 3/4 for my A body I used complete brake assemblies from a 73 8 1/4 - drums, brakes and back plates, and it all bolted on and worked great. I do not know if your 7 1/4 stuff will work.