If that D2OF-UB is/was on a '71 Torino it's likely a replacement for the original since that tag # indicates it's 72 (D2='72) carb. The tag crosses to a service replacement carb # D2AZ-9510-C, which according to the parts book I have, is for a 351W with manual transmission.
There was so much interchanging and replacing going on back in those days it's kind of tough to track them, and many carbs could be interchanged with a little fiddling around. If memory serves from my old parts department days the 2 most popular replacement 2 bbl carbs were the D2AZ-9510-C (351) and the D2AZ-9510-P, which I think was for the 302s and possibly earlier 289s at that time.
Ron