This is a pair of Holley four barrel carburetors designed to be run as a pair; Holley list numbers 2804 & 2805; Ford part numbers C3AZ-9510-BK and C3AZ-9510-BJ. They have been owned by me since March 1965; I removed and bagged them in the summer of 1965 to install a 600 CFM pair. They are off of my 1964 Galaxie 425 HP R-code car. They are corrosion free and look like they could be bolted on and run; Photos available, PP OK