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Is the 750 comparable to a funnel and gas can?

I don't think I've ever run anything on my 340's smaller than a 750 Holley. If you can tune it, a 750 will run fine on even a stock 340.

If you have a 750, run it and see how you like it.

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That's what I'm gonna do. Just wish it was a vac sec 750 and not a double pumper. Maybe i can get someone to trade me for a 650 DP.

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750 vac sec would be the better deal for a "street cruiser". Considering the combo you have, you are on par with a "warmed-over" 340.
If you have to have a double pumper, go with a 650 cfm. You'd have great throttle response on the street, but with some gas mileage penalty (not as bad as you think though). The 750 cfm vac sec offers more airflow capacity, and adjustablilty of when the secondaries come in. Since you don't have too much in the way of a converter in the tranny (or rear gear ratio), the vac sec would be ideal for good gas mileage. Your chioce though, choose wisely!!