greg, them cork floats do cause trouble, I have had the same Problem, make sure the float does float, and ensure a closed position on the Inlet valve seat (to ensure the fuel bowl fills to level within bowl area), 2nd make sure the middle pedestool is seated correcly with a gasket each end, and ensure the outer bowl gasket isn't under too much force, (danger of cracking the outer fixxing lugs). Look for a Crack under the Bowl Area near the idle tube on the Lower Casting, Its a Common Crack Area,

Well thanks to all for their thoughts and ideas. I also call JimZ to get his opinions and through everything I was able today to get the carb working w/o leaking.

First I adjusted the T-handle bowl drain all the way in since I had not done that prior thinking it was an adjustment screw on my last rebuild attempt. I made and placed a cork gasket under the venturi tube instead of the hard paper I had that came with the carb kit. I also adjusted the high-speed plunger so there was some free-play (essentially would flood the tractor if I left this way before trying to start). I also played with the rubber on the float plunger to make sure it was floating around to seal and still soft. Last, I played around with the float to insure that not much fuel went into the bowl cavity essentially bending the brass arm.

Last to check out my work I placed a 3/8 clear PVC tube into the fuel fill when all was back together and started feeding water into the tube to see how much if any leakage I had. Tightened the bowl screws a bit more and waited 30 minutes and no leaks! Placed the carb on the tractor after draining the water out and the carb ran better than before the rebuild....what a concept. Now four more to rebuild on some smaller tractors that are not running right.

Greg,
Thanks for posting your repairs and proceedures.