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My friend recently had an overflow issue with his Quadrajet so he temporarily threw a good used Edelbrock on it to get around until we could fix the Qjet.
Thanks to the mechanical secondaries on the Edelbrock this has resulted in some pretty poor gas mileage and performance so I thought I'd take this chance to show some of the difference between mechanical and vaccuum secondaries on a heavy or less powerful vehicle. In some cases less is more and that is certainly the case here when comparing how much CFM a small engine sees at initial wide open throttle.
This is not an attack on Edelbrock carbs by any means, mechanical secondaries work just fine on engine that can handle the CFM and Edelbrocks excellent engineering can be seen through how well this Edelbrock intake works with this Quadrajet carb that is more appropriately sized for this engine.
Honestly this is more about mechanical secondary VS vaccuum secondary than Qjet VS Edelbrock.