The experts will have to back me up on this, but as far as I have learned, you will need to replace everything except for the axle and spindles -- backing plate, wheel cylinder, all the shoes and actuators, and the drums. You do not need to replace the axle or spindles.
Of course, you do not actually need* to update to Bendix ... unless you need to replace the Hucks because they are worn out or damaged or incomplete. I am running Hucks still on my '49 and I cruise (when I am not under house arrest by the nanny state ...) 60-65 MPH and do just fine with my brakes. Just food for thought.
*"Need" is not the same as "want" ... There are benefits to updating to Bendix, so if you want to do so, by all means, have at it. But don't think you have to because the older technology is somehow dangerous or whatever. I have survived so far on my Huck brakes and see no need to replace them with new fangled modern technology just because someone spun me up into some kind of nervous nelly kabookie dance of death (I learned that from 52carl, BTW ...)
