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?

Does it seem like it “sneezes or coughs” when it dies out? If so, probably is still a bit too lean…You may have to check the throttle cam pick up adjustment if this happens while running just above dead idle speed… Will this happen if you are idling as well?
I misunderstood, I thought you had trouble restarting the engine after it stalls…
I’m thinking this situation might be solved by just richening the idle mixture a slight bit more…

I had a similar situation on a ’53 25hp a couple years ago. My motor would be going along fine and all of a sudden it would quit just like it ran out of gas. I did the usual cleaning the fuel passages and a using a different fuel tank. Could not find anything wrong. I noticed my needle valve in the carb did not have the little wire thing that holds it to the float. I ordered a new needle and seat and my problem went away. Was it possible the needle was sticking to it’s seat? It runs fine now!

dale

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