71 swinger. Manual or power brakes
I changed my 68 to 73-up discs. Had power, but during rebuild I am switching to manual. Though, mine won't be a DD. I didn't want to look at the ginormous bulbous booster all the time,
1) lightweight A bodies stop fine with the CORRECT Master Cyl, and Proportioning valve.
2) better "feel" for what is going on.
Keeping manual steering for the same reasons. Plus theres the benefit that no one else will want to drive it.
Here's a link to a good article
http://www.moparaction.com/Tech/archive/disc-main.html