I've just never had any luck with "rebuilt" carbs from parts stores. The parts store we deal with won't even sell them. Nor, will we. One good one, out of ten, would be good odds. The one you buy may or may not be jetted correctly for your application. I guess that is why I'm trying to get you to fix the one you've got. If, in fact, that's even the problem. As carburetors go, yours is one of the easiest to rebuild. The only critical adjustment is the float level. If you buy a good, quality, rebuild kit, it will come with instructions for the float adjustment. The rest of the rebuild is just thourough cleaning and replacing gaskets. I'd recommend NAPA for the kit. Good quality. If you are dead set on replacing the carb, I'd recommend staying with the automatic choke it at all possible. But, with some modifications, you can switch it back to manual. Again, your call. The fuel inlet, as I can tell by the pics, will be your biggest hurdle. But with some perserverance, I'm sure you can do it. Good luck, either way.