Cusser
+1y
I think I'd re-do the gasket under the Weber carb, and use sealer there. I'm using a gasket I made from rubberized sheet gasket from O-Reillys, easy to cut with shop knife. I drilled the holes. I used Permatex Aviation as sealer (Ace or O'Reillys). I think I also did similar for the gasket under the upper adapter, and torqued that.
I did this late October with my Weber after having horrible idle after removing the carb for my engine work, and mine purrs like a pussy ever since, daily driver.