Re: 750s and 780s....3310
The newer (3310-2 on up) 750 cfm 3310 carbs use a straight leg booster which is slightly more restrictive than the earlier down leg booster from the early 3310 (3310 "EH" and 3310-1) carbs. Straight booster = 750, down leg booster = 780.
Eric
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