ive got a 63 chevy stake side c20 and i believe that it has a 230 in it. It is a 3 on the tree with no syncro for first so from what I heard I think that means it a muncie. My problem is that is is really rough at low rpms and blows a lot of black smoke when it starts. should i just rebuild the carb, replace it, replace the whole motor, with another 6 any suggestion at all would be greatly appreciated.
