its a rochester B carb. thing is you can start it, get the engine warm and push the choke off hold the accelerator to the floor and it will run very rough for a short time, then die. If drive down the road with the choke on it will run smooth but once you get around 40-45 mph and try to give it more accelerator to go faster you hear a sucking sound in carb and sounds like its bogging down till you ease back off the accelerator. i have took the carb apart cleaned it in paint thinner then with carb cleaner, blew it out with the air compressor, put in a rebuild kit, all this has not helped a bit.
