Latest update...
Replaced the master cylinder along with new SS hard lines down to the H block. Easy install and the new hard lines look great.
Dug into the rear brakes. Replaced the rear wheel cylinders and the flex line down to the rear axle. Everything went well, especially considering that I haven't worked on drum brakes in 25+ years. The hardware including shoes were in good condition.
Down the road I'll probably pull the whole axle and refurbish completely. I'm thinking that may happen when I pull the body for paint.
Started on the front, and the hard lines are in worse shape than on the rear axle. Decided to go ahead and order all new SS lines for the front axle from Wild Horses. I was intending on replacing the wheel cylinders and all 3 of the front flex lines.