I am not a big JB Weld fan, yes I do keep some on hand, just not a big fan...
In your case I believe I would try it, as long as the gasket between the elbow and the carb is good, the JB Weld won't be able to stick to the elbow, I would just pack the void full.
You will probably want to take the screw out and put something on it to keep the JB Weld from sticking to it then put it back before you pack it full.
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