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Scott,
A four hole spacer is going to be counter productive on your motor as it effectively reduces the size of the carb. It's a band aid on a motor with a too large carb. A 750 on your 427 is not too big. Run an open spacer or none. Start with your secondaries at 1/2 turn from lightly seated and the primaries at 1 1/4. From there, just adjust the primaries to dial the mixture in. You'll most likely be starting off a little rich. Go slow with this. Turn the screw 1/8 turn and wait for the motor to settle down then go again. Keep in mind that stopping at highest vacuum reading is going to leave you fat. Keep going until vacuum drops and or RPMs drop then back up to regain Vacuum/RPM's. Remember, go slow.
Frank
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FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
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