These listed numbers below for distributor shafts, cams, and vacuum advance units are the actual stamped numbers on the parts as you find them.
Since all parts 1960 and 1961 and all parts 1962-1969 can be interchanged, there are many non stock combinations of parts. The centrifugal advance timing is controled by the cam, the distributor shaft (the timing control hole varies in size and location, thus controling amount of advance; in conjunction with point cam bottom shape, and interaction with the advance weight shape).
The bottom chart lists the actual distributors used with each engine for each year, both smog and non smog. The number is on the side of the distributor housing and all distributors numbers begin with #1110xxx. Thus, it is the last three numbers which define model of distributor. (Remember, the internal parts might not be origional, just because the housing number is correct).
Vacuum advance numbers begin with #1116xxx, the last three numbers being the ones stamped on the actual vacuum advance arm.
