Oh Boy (Opening a big can of worms) There are no numbers on a 67 engine - hence no such thing as numbers matching.

There is the concept of the original engine (which you do not have) but other than telling the truth, there would be no way to tell if you have a correctly dated 67 drivetrain.

68 Cars got the SO numbers stamped on them (mostly) and 69 cars started with the last 6 digits of the VIN.

John P.