Good Morning Vince,The metering vacuum port is as you say on the driver side of the carb and a little passed center on the carb and the full vacuum ports are in the base plate of the carb.You should be able to reduce idle to 700 rpm and then adjust air/fuel primaries.The vacuum gauge of total vac( 14-16 inches)may fall a little and if so advance distributor to get back to the vacuum you had and again reduce idle to where it my die or at least 700 or less.As you advance the timing so does the curb idle.Let me know how you do,good luck.          Sal C             nosal1