Depending on the application, not every carburetor screws and works. But it's a great carb once it's dialed in, which isn't a big deal. It just needed a few small adjustments and everything was fine. Replaced my old Holley 770 Street Avenger and this one is much better. I have a 383 camera in a Plymouth Roadrunner and the bass has improved a lot. There is no stumbling and it runs smoother with more power. Looks well done. Top quality. Now I understand why guys are switching to Quick Fuel carbs. Just take it and get it over with.