Try to find a 1971-74 Buick 455 Q-jet (800cfm) and swap the throttle plate only.
You cannot swap carb tops unless you modify the idle air system in either body or top to match eachothers system.
Pontiac Q-jets uses idle air from the carb top, and Buick Q-jets uses idle air located in the floatbowl.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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