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The BJ/BK carbs had 4033 metering blocks in front, plates in rear. They were 600 CFM to match low riser heads. They BC/BDs were 710 CFM and came with the medium riser heads and intake and had 5731 metering blocks in front and plates in rear.
Excessively high idle (if not inducing timing advance) can come from an attempt to set the idle position equally on both carbs. Everything I have read says to set transition slots to square on the bench and then set the idle with the front carb once mounted.
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