No 1970-74, except 1971 455H.O., Pontiac Quadrajet uses the "ordinary" ported source for the ignition vacuum advance above drivers side mixture screw.
Instead these engines uses the TCS system to control the vacuum advance.
No vacuum advance at idle, only with cold or to hot engine and when final transmission gear is used.
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1966 GTO Tri-Power
1970 GTO TheJudge
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