Could be a manifold leak. If the intakes on the manifold are not sealed good then it will run rough as it is drawing air and not having enough fuel which is why it will only run on choke. Been there, done that.
Crank down on the manifold bolts a little to see if they are tight and try again. You can also spray a combustible along the gasket to see if the motor suddenly picks up revs from the combustible.
Same if the gasket at the carb to manifold connection is leaking.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for �200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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