Very nice GM rochester quadrajet carburetor. Codes out as an early 70's (1972) big block. (note the carb inlet typical to Cadillac, Chevrolet: not the fuel inlet direction vs. an olds, buick or pontiac) This carb is very clean and very tight. These are great, capable carbs when correctly, properly set up. I have not run this carb but it should start up, run out and tune well. It has not been abused and is a great upgrade (or spare tuning carb) for vehicles currently having tuning or running problems.