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OK, well I am asssssuming you still are using the original two line pressure tank, let us know if someone has changed it to a single line/fuel pump system..
What do you mean by “fast idle”? I’m guessing that means just what it says, a throttle setting slightly higher than dead idle….
This issue could be many things, start with the simple stuff to avoid getting more frustrated…
Perhaps the engine is running out of fuel for some reason at slow speeds. Try having an assistant pump the fuel primer button while the engine is running slowly to see if the engine keeps running OK. Have you tried pumping up the fuel tank primer after the engine stalls? If so, does it start any easier?
I know you said the points/coils/condensers were replaced, doesn’t mean there isn’t an issue. Try testing spark once the engine has stalled and won’t restart..
Perhaps there is some water in the fuel, are you sure the fuel/oil supply is fresh/clean?