10 X 1.75 rear drums on 7.25 rear vs. 8 3/4

Yeah, I parted out a wrecked '70 Duster with a 318/3-speed and an 8 3/4" rear with flared drums......what's up with the flared drums?.....cooling? Whatever....I'm gonna run these 10" drums on the new 8 3/4" rear I just installed......I feel like doing a victory dance!!