750 is way to much for your combo.
I have a 650 mechanical secondaries on mine and it runs around 12.1:1 air fuel (don't know jet size) in a 10:1 compression motor and a .500 lift / 228 duration cam.
I would think 600 CFM would be good for your application
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1974 Triumph TR6
1985 Monte Carlo SS
1986 Mustang GT
2011 KIA Optima GTS
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