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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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