yes! You get uneven friction surfaces etc from when parked for extended times It feels like the drums are oval shaped [and pulse]. but is actually an uneven co-efficient of friction Sanding the shoes also helps.
Sure you can have the hub/drum ***emblies turned. Don’t try taking the drums off the hubs. Tell the tech to take it easy on them as they don’t make them any more. Some like to take a deep cut, which you don’t want.
I'd consider just fitting a vacuum power booster on the drums. If your not doing a lot of towing and mountain driving the power boosted drums will be more than adequate for a cruiser. It will also be a lot cheaper and easier
well it sat for twenty years i’ll try to clean up before i take them to shop and turn them. thought about disc but i have 14” slots. don’t think the disc fit the 14”.
If he might have uneven surfaces now, he damn sure will using a flapper wheel to clean the drum! Nothing more than emery paper by hand should be used on drum brake surfaces. I'd take the drums to a shop that can check them for trueness, and can do a slight drum turning if needed.
PBR VH44 I've never had an issue using a flap wheel in a cordless drill. [or using a flap disc on brake rotors] but this doesn't account for the incompetence of the user. If an idiot wants to spot reduce some rust he will cause problems @Huckster59 give them a good cleanup with a flap wheel in a cordless drill [don't lean on it, and keep it moving] If you need the drums machined, you will need oversized matching shoes. Do the DIY part first, before taking it to a brake machinist. Brakes don't go out of true while parked [it takes heat cycles] The flap disc is a trackside repair I've done that has been very successful once I got my wife to spin the rotor while I took to it with a flap disc in a 4" grinder. Then the caliper is re-installed and back on the track again [up to 170mph] This ^^^ was caused by debris picking up in the rotor.
If you go with disc do no use speedway, i had to modify brackets to get them to work and they make the front 2 inches wider.
disc brakes and dual system master cylinders are some of the few parts permitted regardless of the pre 65 rules