So I had my 200 six engine running and it was leaking gas out the accelerator pump, and possibly the throttle shaft. i have a box of two other auto lite carburetors. When I disassembled the carb that was on the car I noticed it had the top half of one of the others. It appears two are the smaller throat, and the one I want to use is larger. I have reviewed mikes carburetors and am going to order the bushings and a few other parts. There are a few minor differences between the top halves. Mainly the needle is longer on the larger carburetor and the horn in the center is supported