Really the first thing people need to know in order to help you and provide the most applicable opinions, is what do you need saw(s) for?
You've got some old awesome Stihls, if you don't want to have to deal with them surely you can sell them and if you want something that is new(er) and will run great with minimal maintenance and less chance they might fail on you, there are lots of options. If the old saws have sentimental value, everyone understands and can help you fix them. There's probably someone you could meet from on here in your area if you need more "pro" help and experience - I see lots of folks on here from NJ.
What do you need to cut? And how often? If you just want to have cool saws around, very lightly used if at all..... well you're in the right place too
My opinion, sounds like the 041 should get fixed first - could be simple (points and/or condensor, ground wire/op switch). There are some posts here even recently about those saws. And I think they can be modified to add a more modern ignition system to it.
The 020 will obviously be a lot more work. After you fix the 041 and it is good to go, take the 020 apart - see what the cylinder looks like. Hard lesson to learn - never straight gas and if anyone else ever uses a person's saw, they better be 100% informed of what to use and how to do it (the basics of the saw, and how to cut), or given the supplies so they don't do that. It's the same thing when you have a diesel truck and you lend it to your buddy so they can move or haul something big. They think they are being gracious and fill it up with gasoline! WOOF. quick failures