I've been running the Langdon dual Carter/ Webers on my 235 for the past 14,000 miles and will verify that they are as efficient, easy to mount and maintain as you could want. They work fine with the crap gas they're selling and as Leon mentioned, you set them and forget them.
The C/W's work great in tandem on the 235 while the Holley/Webers would be a better choice for a single on the 235 or in pairs on the 261 or an over-built, over-cammed 235.
I'd like to point out that running dual carbs on any vehicle that is running a stock cam profile is NOT going to turn the engine into a powerhouse. However, the visual effect on the 235 is quite obvious and draws plenty of comments. In addition I've run the single holley/weber on a 235 and as with the dual Carter/Webers ALL the problems with leaks, hesitation, starting issues, and warped air horns are cured.
I've got extensive documentation and pictures in my Webshots Chevy albums of the carb conversion. Check them out....you won't be sorry you ditched the stock carb(s).
Dave
