I did find the exact Rochester carb 4bb from a great company in El Monte, Calf. Carburetor Exchange. No waiting..in stock
and shipped instantly. $299.95 plus core charge. Well packed with extra packing for choke. Box ready for core return. They
have excellent reviews. After carefully installing carb my 57 Caddy started instantly and smooth performance with choke working
correctly. A hassle free way of doing the job right. Thanks Carburetor Exchange. Google their Web site guys.