If it " floods almost immediately, both from the bottom of the Zenith carb and also fuel squirts from the gasket where the carb meets the throat of the manifold" something is drastically wrong in the carburetor.
It would seem that, at the very least, the needle valve is not closing when the fuel bowl is full of gas. Whether it is a float that doesn't float, or a float that is not set correctly, or dirt in the needle & seat, or some other thing, there are major issues with the carburetor that must be sorted out and corrected before there is any use in looking further.
I can not say that I have ever seen gas "squirt" out of the gasket between the carburetor and the manifold.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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