Since your carb doesn't have 25A, 26A, and 27A, that means it is a "fixed jet" model. Therefore it needs to have 29 (the main jet) and 30 (main jet gasket). Are they in there? If not it will run extremely rich off idle.
If the venturi was installed upside down, I don't think the bowl will go on fully. If tightened down that way, the top is probably warped. It needs to seat fully for the idle circuit to work.
When you service the air cleaner, did you clean the wire mesh inside the canister? Also check for other obstructions, like dirt dobbers and mouse nests.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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