I have had my Holley 4000 teapot carburetor on my Ford Fairlane 500 supercharged 312 rebuilt by David Arey and it came back looking and running like new. He advertises his rebuilds on Ebay as(1955 1956 1957 FORD HOLLEY 4000 4 BARREL CARBURETOR REBUILDING SERVICE). You can contact him on Ebay or his contact information is David J Arey, 8094 Mountain View Drive, Northampton, PA 18067 phone 610-703-2014