I got this carb. YF 2101 S. I know where the gas goes in, and the vacuum port for the dist. But there is another connection that I don't know what to hook up to it? Or block it off? It seems to be automatic choke. I have been using a YF carb with manual choke. I have a 1956 235 engine in my 48. Thanks.

http://i1022.photobucket.com/albums/af342/scotphotobucket/yf2101S1.jpg

http://i1022.photobucket.com/albums/af342/scotphotobucket/yf2101S2.jpg