I had a Weber on my B20 144 and switched back to SU's. The weber is easy to adjust and jet, and it also sounds cool when the secondaries kick in. Idle is very smooth. The problem with the weber, I found, was that it doesn't run as well in the cold (below 50 degrees), the choke isn't as effective as the later SU's and the small open air cleaner on the weber gives the motor a loud sucking sound on acceleration. I also had a problem with engine case pressure because the vacuum inputs on the manifold are different than the factory ones on the SU manifold. This lead to oil leak problems on my car (which is the main reason I went back to the SU's). It's possible there were other contributing factors, since I bought the car with the weber already on it. There are pros and cons to each.