Progressive 2bbl

I have used the progressive Webers on VW air-cooled engines and 2.2L Mopar 4 cyl. The stock plastic foam float does not seem to work well with the modern gasoline. After a couple days the floats can sink. Years ago brass floats were available. Make sure there are no snags in the manifold at the carb mount. An air cleaner spacer 1-2" high above the carb, helps the flow. Manifold heat is important for cold temperatures.
When correctly tuned, the power, response, and economy are great!