It really is impossible to advice jetting on an unknown carb.
ALL restrictions, idle tubes, idle airbleeds, idle downchannel restrictions, main airbleeds, acc-pump jets needs to be measured and then modified/adjusted properly for the application.
For an original 1966 Pontiac Tripower on a 455 75-64-75 does not seem too far off.
BUT the idle tubes and downchannel restrictions needs to be opened some.
.036"-.038" idle tubes and .050"-.052" idle channel restrictions to begin with.
And, Holley jets are for Holley carbs, they are NOT equal to Rochester jets in any way.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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