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Is has a 6.5 power valve on the primary and none on the secondary. Yes, the gas is 10% ethanol. Thanks guys!

I recently installed a wideband O2 sensor and gauge on the car. The motor is a 73 440 with headers, 3"exhaust, mild cam, aluminum intake and holley 770 street avenger with vac secondaries. So far I have #71 jets on the primary and #69 jets on the secondary. I'm seeing 12.3 to 12.6 during WOT...