You are looking at factory Ford Y block 4 bbl Holley model 4000 carburetor from a 56 Ford Victoria. Ford pt # ECZ-9510-B list # 1161 1 is correct for all 56 Ford & Mercury cars with 272 292 & 312 engine including Thunderbird. This carb is being offered as a core for rebuild. Someone did remove one venturi flap. Otherwise complete. All moving parts move freely including idle screws.