Unless you´re running full throttle at 170 km/h all day long at the dragstrip you don´t need them.
The mechanical fuel pump will show its shortcomings long before the need for larger needle valves in the outer carburetors.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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