For what it's worth, I've seen issues with the Holley carbs due to floats sticking. This occurance has been on new out of the box units; I understand there is a "repair kit" to corrects this known issue, but why would someone want to buy a new carb and then have to buy a repair kit it make it work? The Edelbrock carbs I've used have worked the first time right out of the box and continue to do so years later.