I would NOT use any other inlet valve style but the original style and size.
This is IMPORTANT to avoid all sorts of fuel delivery issues as flooding, reduced flow etc.
Most troublesome are the integrated "disc" type inlet valve, i have since long lost count of all the folks i have helped with their carbs where this inlet valve was used.
A 1966 Pontiac Tripower center carb uses a .120" inlet valve seat with a clip on the needle and the outer carbs uses .086" valve seat, no clip.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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