Carburator rebuild:
Thanks to a member of this forum, I got a correct Carter BBD carburetor (1969 - 4608S). This simple carburetor should actually be an easy project, but it was not. During the disassembling, I noticed that the two brass needles in the venturi cluster cover were loose and there are two possible locations for them. Plymouth Service Manual was not really helpful and on the internet were a lot of inaccurate drawings, showing those brass needles on the inner or outer location. Next, in the carburetor base were two different idle mixture screws. Correct, early style BBD carburetor idle mixture screws are obviously not available through suppliers. After a hint from a FABO member, I installed the brass needles in the outer position. Here some pictures: