I have taken a couple of pictures of the quadrajet carburator which came stock on my 1985 sbc. I am going to use this carb on my roadster pickup, for the sake of economy. This engine came with a ton of "clean air poop" on it, which I have removed and trashed. (sorry to all you tree hugger types). I have plugged all the various vacuum ports on the carb, except the one on the rear side at the base, which will be used to power my distributor vacuum advance pot. The person I bought the car and engine from had added a pull type manual choke to this carb, and I don't know if he removed some linkage or not. I can't figure out what opens the choke plate on the large bore side of the carb. It seems to be spring loaded shut, and although there appears to be a place for a linkage at one end of the butterfly shaft, there is no linkage there. Also, there is a large tube sticking out the front side of the carburator at the top, and I don't know its purpose. Is it a vacuum tube that I can safely plug, or is it some kind of overflow tube for the float chamber? Thanks for any help---Brian