I can tell you what I have learned in the last six months putting my 235 together with dual carbs. Langdons claims to have bolt on carbs that are set up and ready to go. I have heard both good and bad about these carbs, (I think they are one barrel) and decided not to use them for only one reason, I wanted the look of the older carb. For a nearly stock engine you would want carbs that were designed for a 216. I purchased matching Carter 964S carbs and actually have them running pretty good after messing with them for weeks on end. I then found out that Carter W-1s would work better since they are not vacuume actuated. I am told the W-1s are easier to set up. I have purchased the W-1s I need but have yet to install them. Carb King has an excellant article on this subject. I also found the linkage is not just a hook it up job. I ended up fabricating my own throttle rod, carb linkage and pivot. From my experience this was not a job you will have done next week, especially if you don't have the carbs yet. You will also have to adapt the bolts on the intake manifold to fit the 2 5/8" centers of the 216 carbs or purchase a manifold for the 216 engine and also purchase adaptor rings so it mounts up the the 235 heads. Another thing I learned, get the headers ceramic coated. Had mine done and they still look new. I went thru a lot of work for dual carbs but they look good.
