A broken down Holley will fit in a gallon can, but an Autolite 4100 sure won't. My solution was to buy two cans of the carb soak and a big cheap stainless steel cooking pot. A 4100 carb fits that just fine.
Real carb soak is more like paint remover than anything else. Nasty caustic stuff, but I don't know of anything better to really clean a carb.
Though lacquer thinner is quite volatile, it's basically just paint thinner and almost the same thing as spray can carb cleaner. Helpful, but it has limited effect on really nasty deposits. Yes, you can use it, just don't expect nearly as much effect as carb soak. I have an air-pressurized can I keep filled with lacquer thinner that I use just like carb cleaner. It works just as well if not better and I can refill it myself from a 5 gallon can. I use the sprayer for all kinds of stuff including final parts cleaning before paint or assembly. (Not while smoking)