1964 Dodge Dart manual

Hi guys, I have a 64 Dart manual that I printed out from a disc that I bought a couple years ago. My question to everybody is why is there no mention what-so-ever of the 273 engine in this manual? And the really funny part is there is stuff about the 318. Is there another late year manual out there that has the 273 listed or should I just get a 1965 manual?