4 places to check...
1. The Firewall Datatag,
2. Drivers side door for the VIN #. (The VIN will NOT match anything on the Data tag.. just a ref. for the title. and the location of what plant it was built at)
3. Front passenger side of the engine (below the heads) for the engine 2 letter code (should be YS if it's a 67 auto)
4. Depending on the build date.. check back where the distrib. comes out in the rear of the engine.. there you will find the block id. for 67 it should be: #9786133
Once you've located all the codes... check out this site:
http://www.yearone.com/updatedsingle...ontengid1.html
Good luck!!! PM me if you need any other help... I love decoding these beasts!!!