1968-74 primary rods with "B" suffix are used only in Qjets with the APT adjustment located in the throttle body from factory.
Primary rods w/o suffix are used in all 1965-67 Qjets.
And, 1966-74 Pontiac Qjets never used the rods with the "B" suffix from factory.
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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