George, a leaky bowl gasket won't cause the carb to leak, assuming the tractor was parked reasonably level. You need to replace the needle and seat. It's also possible the float has a leak; shake it and see if you can hear gas sloshing around inside.
I've learned to always turn off the gas on my tractor. If the needle and seat are even slightly leaky, the whole tank of gas ends up on the ground when you have a gravity-feed fuel system.
I don't bother running the carb dry on my tractor, but usually do so on my small engines. The less gas to dry up, the less gum is left in the carb. The only engine I've run into that seemed to have a problem with that was on the Harley Sportster my wife owned. After it would sit for several months with the fuel turned off and the carburetor run dry, the float would stick open. I'd have to take the bowl off and jiggle the float, then it would be fine the rest of the season.
I don't think gasoline in the carburetor serves as a rust preventative. Rust means there was water in the carb.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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