ZS 150CD vacuum advance....

[rhill <hill@mninter.net>]

Just received a rebuilt Z-S 150CD and I am having the following problem:
 There isn't a connection for the vacuum advance.  There should be a
connection on the bottom of the carb for this (there is, however, a
brass plug where the connection should be). 
        This leads to the following question:  Can the vacuum advance be
connected to the same port as the EGR valve? (the top port?), or should
I just return the carb to the vendor? 

        Thanking you in advance, 

        Bob Hill