This one has always puzzled us. Almost every muscle car came from the factory with a Holley carb or Carb(s) on it. That includes Shelby's, Cobra's, Tri-Power Vette's, Big block Chevelle's, Six Pack Mopars, Ford "6V" systems, first and second generation Z/28's, and even motor homes, trucks and commercial delivery vehicles came with factory installed Holley carbs and none of them ever have any problems. Most of these cars and trucks are still running today, so it would seem funny that Holley's got this bad reputation of always going out of adjustment or needing to be tuned all of the time. That is SO far out in left field, it isn't even funny. We choose Holley carbs because they work! What do you see on Nascar's? What do you see on Pro-Stocker's? What do you see on the new Shelby Cobra's? ALL Holley's. Do you think GM, Ford AND Chrysler, AND Shelby, AND NASCAR, and all of the million other performance engine and car builder's out there are stupid? Ever see a Nascar have to come into the pits because the carb needed re-adjusting? I am friend's with the entire Edelbrock clan, and I can tell you first hand that Vic himself will tell you for a serious performance engine you need a Holley. He's not about to pull the wool over your eyes and have you buy one of his for your nasty engine and then have it run like crap. They're all about quality and happy customer's. A customer with a carb that just can't cut-it, isn't a good sale for the next items he (or she) may need. Don't get us wrong, there's nothing wrong with an Edelbrock Carb, which is a re-make of a Carter AFB, which is actually made by Weber, hence the WEBER name on the side of the carbs and the "W" markings all over them. For basic performance engines, an Edelbrock carb is just fine. We prefer Holley's on our nasty engines though, and they never need constant adjusting either.