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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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