I’ve done the same thing a few times. The entire drum assembly needs to move over. I also did an 11 inch swap on a couple of cars. Also the big disc swap as well. Gotta love them Cordoba brakes!Yes, if you are changing from small to big bolt pattern you must use the entire brake set-up. I put 11" C-Body brakes on my 69 Barracuda with cut down C-Body axles and it worked great!