The quickfuel carb ran OK, but not great. It made gobs of power as the secondaries opened. When I hit it I could spin the tires at 40 MPH. I put some Nitto tires on the back to try and get better traction! Biggest issue was the poor low speed "manners" that it had. Edelbrock and Holley style carbs use a very different methodology to get the job done. Holley generally makes more power so that's why people use them. This newer AVS2 model with the improved annular boosters vastly improved atomization of the fuel so idle & low speed throttle response is crisp & superior to any Holley style carb I've ever used.