It is probably not a carb related issue at all. Is it a 6 Volt or 12 Volt? Front Mount or Side Mount Distributor?
First, if you are sure your firing order is correct--1243 CCW and you have good spark plug wires (copper core) and new Autolite 437 plugs gapped correctly at .025....then I would say you need to look at this as a distributor related problem.
The more info you can give, the easier it will be to diagnose the problem.
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