To convert to discs or not convert? That is the question!
I need direction and reasons in terms a non-mechanic could understand. Upgrade to discs or keep all drums?
The primary advantages of the disk brakes:
1. They are less likely to overheat the lining material.
2. It's usually easier and requres less skill for a mechanic to change pads than change shoes.
Details:
Heat can be an issue if the brakes are undersized (they're not), if your making rapid repeated stops from over 60 mph, carrying heavy loads or have many steep hills. With these duo servo drums fade is extra noticible because there is less self-assist. But (a) your car has power brakes, so that would help some, (b) you can do a lot to prevent overheating.
If you live in a place with lots of steep grades, will be towing,etc. then down shift so you're not riding the brakes and make sure the shoes have linings good for higher temperatures.*
It's true that as long as the brake calipers don't hang up, pistons retract as they should, then changing disk brake pads is easier than installing shoes for drums. Find a good mechanic and this really isn't a problem.
Advantage to keeping your drum system is that it works, was pretty well designed and implemented by the factory, and all you need to do is maintain it.
Very little in the aftermarket is plug and chug. There's always something that doesn't fit, or needs tweaking, or has a domino effect. If you are hot rodding, then that's part of the adventure. For the average guy, collector, just get good shoes, new hardware if needed, adjust 'em, and fresh fluid. You're good to go.
*The side or back of most brake shoes will have a material code with two letters at the end. Those letters roughly indicate the friction. The first letter is friction rating at lower temperatures, then second one at higher temperatures. EE is pretty typical for shoes. If you don't like the parts store shoe offerings, then you might want to consider Rochester Brake (NY) or Porterfield Brake.
