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340, larger than stock cam (no specs), RPM Air gap, stock bottom end, headers
Looking for a Holley 750 double pumper
I think I have it narrowed down to the 4150 Street HP,
anyone run this carb on a mostly street driven car??
Opinions

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Opinions are all over the place, aren't they? One important piece of information that carb questions should include is the OP's desire and/or ability to properly tune the carb. And also, what's more important to you; maximum performance or maximum drive-ability?

Most guys are not carb tuners and don't have the wide band, drill bits, jets, bleeds or knowledge of the carb's circuits to get the most out of their choice of carb. For them, the carb that comes out of the box closest to the design and tune that their combination likes, is usually the best choice. Or at least the best starting point.

There are a lot of different configurations of 750 cfm carbs. All of them will run your car, but some will do a better job ON YOUR COMBO than others. But that doesn't necessarily mean one is actually better than the others, just maybe that it is closer to the tune that you combo likes.

A good tuner with the proper tools and experience can start with most any 750 and get it to rock. But the farther away from the combo's preferred tune the carb is, the more changes the tuner has to do to get it right. So whether an experienced tuner or not, it is best to start with the carb that is closest to the tune that your combo wants.

And irregardless of the tune, some carb configurations are designed to do one job better than another. Like spread bore or square bore, mech secondaries or vacuum, annular or down leg boosters and on and on.

Sorry for the long response. But carb selection is as complicated as cam selection. Most guys turn to a cam grinder for recommendations. And any cam guy worthy of your money will want A LOT of info on the engine, drive train and the customer's desires before he makes a recommendation.

In order to get the optimum carb, the same approach should be taken. How about asking Thumper to set one up for you? Tell him what you want and what your combo is and let him pick the platform and through his tune in it. That would likely get you a better carb than the one ordered by a catalog number.