Only real problem I've read about are sticky pistons. The other issues like dragging pads or locking up the rear drums are related to master cylinder size and proportioning valve.
If you rebuild the calipers, get a 1 1/32 new master cylinder (for manual brakes) and a prop valve for the rear you should be in the clear. The adjustable prop valves seems to be the ticket - this way you can dial the system in for your specifc rear drum size and master cylinder. That's what I'm going to do - hopefully my research pays off and I have an experience similar to 66fs's.
