55.2-59 Carb linkage issue

[popeyestruck]

Ive been fighting with the rochestor bc trying to get it to idle . It idles way too high and wont adjust down around 1200rpm. Ive checked all the usual vacuum leaks etc . When I put the truck together I needed to make my own linkage. The linkage that goes from the bellcrank on the block to the bellcrank on the carb seems like I made it a little too long. Would this keep the throttle open too much? If I turn it down a few threads and shorten it would allow the upper bellcrank to rotate further. Does this make sense? Its acting as if I have my foot on the gas .