To upgrade to Bendix brakes you'll need to swap the entire brake assembly- - - -backing plates, shoes, drums, probably front hubs, etc. If you can figure out a way to make the backing plates fit the rear axle housing and the axle flange is the right diameter to center the drums, I don't see a reason the whole system couldn't be adapted. Be sure to factor in any differences in the bore and stroke of the master cylinders- - - -that might need to be changed as well.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!