Holley 4000 4 barrel carburetor for 1955 Ford Mercury and Thunderbird. Carb. was professionally rebuilt and are off a very good running 312 engine. When I first listed these I forgot I eliminated the chokes because they were used as 2 fours. One says 1075 and the other 1074 9510. I also have another 9510 that is complete that was professionally rebuilt several years ago I will take $125.00 for. It was a spare. So no choke butterflies. They did work well though. $150.00 each. Will sell separately.