The difference between a neutral and a factory Pontiac flywheel/flexplate is about 6 inch-ounces, 170.1 grams, wich if not compensated for will show up as a pronounced vibration over 2500 rpm.
I would guess a neutral flywheel/flexplate with an (1) oz removed would vibrate less. I´m not a candidate for testing this, i would stick to the factory parts.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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