Jon, i have found measuring the total calibration recipe of about all Quadrajet applications made, that Rochester only went to the huge main and idle air-bleeds for 1970 and later Chevrolet passenger car applications, the other divisions Rochester did not change the air-bleeds at all or very little for certain applications.
I agree fixing the choke first would be a step in the right direction.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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