There should be 2 adjustment screws, one for idle speed, one for idle mixture. There is no main mixture adjustment on the gas carbs. About all you can do is adjust the float level. There are several Zenith carbs that will bolt on. You need to determine which one you have by looking at the parts manual, I believe that there are only two Zenith gas only carbs that IH sold for the Super A, although other models should work. Could be that someone messed up the carb and returned it. Since this site does not repair carbs, they could have resold it. This is only a possibility, not an accusation. It sounds more to me like you have a governor problem.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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