This unit is a holly 4 barrel carb that was rebuilt about 20 years ago It was put on a 1955 T-Bird for about a week and taken off. (Customer did not pay for it.) It was keep in this carb box for all those years and forgot about. I would not be surprised if all you have to do is bolt it on and go. You can tell just by looking at it the gaskets look new so the story here is true. Hope someone can use it. I have no idea what it's worth but I paid much more than I'm asking.