the 340 was a "new" motor for the 1968 model year for Dodge and Plymouth. that motor WAS NOT available in ANY Chrysler product prior to the release of the 1968 models in late August early September of 1968. because the 340 was a new motor, i believe Chrysler established a dedicated production line/facility/department to produce those engines. the retooling and refitting of the production lines for the 1968 cars took place starting around Oct of 1967 so mass production of the 68 models could start. i guess it would be possible that a "1968 340 engine" could have been cast, stamped and assembled in the last few months of 1967 but due to the calendar and model year production, that "1967" motor would be for a "1968" car. i do not believe there is any such animal as a 1967 340 but it's possible. chrysler did all kinds of odd things in the first couple of "transition" months from one model year to the next - including using "prior model year" parts on the later model year cars until all the prior parts ran out. one thing i do know - "if" there were 340 engines stamped with a "67" casting date, such an engine block would be a RARE item!!
