There is no good linkage for that application that I know of and I think the Rochester B is blamed unfairly for that. IMO the only accurate way to operate the carbs simultaneously is with a pivoting rod as is done with the Holley/Weber setup or any vintage intake equipped with such. Use a manifold with an integral pivot rod and you’ll get any carbs to sing together. Actuating multiple carbs equally, especially on the new Fenton intake (11”apart) is a lot to ask of the “floating” linkage. If I were to do it again I would use a vintage 216 dual intake with solid linkage and a pair of small Rochester B’s with a 216 split stock exhaust.
