there are 10" sbp drums. you would need to swap the spindles to install them. from the 10" spindles there are upgrades to disks, from the 9" spindles there are not.
i have a 66 dart with 10" drums. i want to swap them to my 71 valiant with 9" drums. how much of the front end will i need to swap? can i just swap spindles? or will i need the control arms too?