72 Scamp front drums

If it is all original, then I would not hesitate to 'shotgun' EVERYTHING there. With that age, the likelihood of issues with any part is very high. Certainly replace the wheel cylinders or rebuild them, and replace the rubber lines. The spring sets may be OK, but if one spring gets weak with age, then it will effect the brake operation and you may end up with a pull to right or left under braking. The drums should be turned too, but if they are worn, then you may have to replace them with new.

Being fronts, be sure to at least clean and re-pack the wheel bearings. Personally, I'd be ready to put in new bearings and races: they are pretty cheap.

There have been some warnings on the wheel cylinders from places like RockAuto being Chinese made and of questionable quality. I have had good luck with NAPA's premium line parts. I also would not bother with RockAuto brake linings unless they were a good name brand; they may be OK, but I do not know, and I got some VERY bad, unsafe linings from a low cost parts outlet. This IS the place to buy all premium parts, IMHO.

As Mike says.... I'd be changing out everything in the whole system. Fronts, rears, and master cylinder and all 3 rubber lines. Water gets absorbed by brake fluid and gets held inside the iron parts and rusts things out. The rubber lines rot on the inside lining and fall apart where you cannot see it and cause all sorts of havoc (like brakes stuck ON) when they do that. Only the main metal lines MAY be good to reuse.

BTW, nice looking car! If it has spent some of its life in a garage, then that is a plus for the overall brake system condition. But my '62 Dart got ALL new parts, including steel lines, despite spending all 52 years in a garage before I got it 2 years ago. It sat for many, many years, and all the brake parts rusted on the inside to varying degrees.