Have you ever considered getting a 1967 pontiac service manual and following the service instructions in it?
It is difficult to fail if youŽd start with this.
If you follow some people's advice regarding the timing settings, it will soon be time to change the engine bearings.
If you want your engine to live a healthy life, use the factory ignition settings.
Especially with the inferior fuel we have today.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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