Hope the engine did not get "bruised" when it was run low on oil. Do you have a mechanical oil gauge in the car? If not an oil gauge and temperature gauge would be a good addition. I wouldn't rely on 40 yo idiot lights.
Just giving you something to worry about. I wouldn't take any long trips for a while. I also think it would be a good idea to compression check the engine, I would do this with any "new" classic.
For oil changes when away from home, I would look for a mechanic shop, not a chain store. At least in a mechanic shop you have a chance to find an ASE certified mechanic.
I had a garage fire a few years ago. I now buy only as much oil as I need for an oil change and return the used oil the same day. I have learned that a home garage is not the place where you want to store conbustible materials. I would like a storeage shed, but live in one of those neighborhoods where this is not an option.