Something I learned about rebuilding carbs... You know that gold color they have? If you boil them out with carb cleaner, or as I like to use, Lacquer thinner, that gold stuff gets washed off. Then, they might leak. Turns out the pot metal is somewhat pourous, and that gold color isn't just for color, it also seals them up. Some of the new fuels can melt that sealer away too, so if you happen to get a partiuclarly pourous casting, you may find it leaks after your rebuild. Some rebuilders don't even reseal them, but Edelbrock does a good job of it. (I've had outstanding luck with a couple of rebuilt Q-jets from them.) The moral is: be careful what you clean a carb with. I think someone sells a spray on sealer, just don't remember who... (CRS)...