I'm not sure if you could call it much of and "advantage", but I feel they are easier to work with and every auto parts store on the planet has parts for them. That may not seem like a big deal when the carb is new, but 10 years from now, when you need a part for the carb in the middle of nowhere, you'll think it's a big advantage. There is a lot of aftermarket support for the whole line of Holley carbs, including rebuild kits and that's always a good thing. Plus, I've never had any trouble with Holleys that weren't my own fault, like not running a regulator with an electric pump, or letting the car sit for two years without draining the bowls. Other than that, the Holley carbs I've used have been trouble-free and provide great performance and fuel economy. I know other people feel the Edelbrock/Carter/Weber carb is every bit as good, but I don't know enough about them to say which is better, so why change what's worked for me in the past?