Holley recommends List #0-80450 600cfm Square flange and List # 0-6910 800cfm Spread bore flange, for 1973 Pontiac 455.
I recommend restoring the original Q-jet if it´s availible.
Hope this helps some.........Kent
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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