What came in it.

Hi everyone. I have a 67 barracuda. It has a 318 in it but I know it's not original. Trying to figure out the code to see what came in it from the factory. The way I read it, it had a six in it. Any help would be appreciated.
You need a service manual, anyhow, go to MyMopar and download one, free. It has the decode stuff in the front of the manual. You may have to accept Dodge/ vs Plymouth manual. Otherwise, google "mopar vin decode" or some such and you will find lots. I think MyMopar also has a decoder on their site