1972 Duster 340 3speed

Ok. I noticed a question on the eBay ad regarding the carburetor. When I got this car the 340 manifold and 4bbl carb and trans were in the trunk along with another 4bbl intake and another 3 speed trans. Why it has a 2bbl car and slant six air cleaner on it is beyond me. I bought 4 tires to hold air and paid a fair chunk of change for a title. I listed it through my buddies shop since it sees more traffic.