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The float level was checked with the top half of the carb upside down. I know that the theory always was the seam of the float should be parallel to the machined surface & the fuel level should be 5/8" below the machined surface of the bottom half of the carb. I have a book by Gordon Bigger who did a book on restoring the Model A carburetor the "Rex Reheis" way. In the book on page 21 he talks about float level & states that Rex felt it was better to have less gas in the bowl. He set another shim under the float needle to raise the float to 1 5/16" when the upper casting is held inverted, looking at the front end where the gas goes in. This is what I followed this time since I could not resolve the problems. I have usually used welding tip cleaners to clean the jets but....I only use the largest cleaner that will go into the jet without using the rasp portion of the tip cleaner. I refrain from enlarging the jets.