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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