7 1/4 drums fit on 8 3/4?

i have a 67 C body 8-3/4 i am getting cut down by moser to fit an A body. my parts car is a 74 dart V8 4 door. its 7-1/4 rear has the same mating pattern for the backing plates (5 holes) as the 8-3/4. plus the drums and wheel pattern are the large pattern that A bodys used from 73 to 76

i am planning on using the 74 A body drum setup from the parts car rear on the 8-3/4