Non-A.I.R 1966 Tripower uses a threaded 1/8" NPT fitting at rear of center carb base for full manifold vacuum to the vacuum advance.
Also, you will need an 1/8" NPT plug for the ported vacuum source on float bowl.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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