Did the shop that sold you the Weber explain that you'd probably need a fuel pressure regulator also? They're notorious for flooding with even a tiny bit too much fuel pressure. If you're going to stubbornly stick with that carburetor, you'll have to spend more money- - - -get the fuel pressure down to 2-3 PSI or it will never quit flooding. Also, install a VERY good quality fuel filter- - - -not one of those Mickey Mouse see through things- - - - -even microscopic bits of dirt or debris will make a Weber flood.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!