Six Pack Carbs?
Watch out when buying any used 6bbl carbs. Most all of them are pieced together units that probably have some damage. Lots of the old carbs you see for sale have warped bowls and housings from over tightening the bowls. If I were buying, I would contact Scott Harms or Chicago Carburetor and get some of their rebuilt units. They will already be filed flat and thoroughly checked.