Flooding

Ok not my car or an A body. My brother just bought a beautiful 69 coronet with a 440. The car had been sitting in a garage for several years. When car is first running hot or cold runs great after a few minutes floods out. I can see fuel drippings from the primary venturis. When hot or cold the engine runs better with idle screws all the way in. So to much fuel right? The car came with 2 carbs one an Edebrock the other a Carter look identical. So I put the other carb on and same thing. Now both carbs look new but have been sitting a few years. Could the needle and seat be bad in both? If I remember right the manual fuel pump has a bypass when the car has enough fuel. I pinched the fuel line when the car starts to load up and engine smooths out. So my question is has anyone had this problem? If so fuel pump or needle and seat or something else? Thank you for any help.