As an M715 with that low a vin number, yes, it would be a 1967. I believe Beast is dead on with the month range and the reason for it.
Hope you dont have problems getting your paperwork. In the past a few times, I have had motor vehicle departments contact me to verify info for a truck when there isn't enough other sources to do the job. If you need that herp, give them my email:
brute4c@m715zone.com
Glad to help if I can.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!