It wasn't common for the partial to be stamped on the base models. If the assembly date and application code on the front pad are in line with the build date on the trim tag, that's about as good as it gets.
The vin will indicate whether the car was a 6 or 8 cylinder but nothing else about drive train. Any trim codes on the tag for options ?
If you haven't already, go to
http://camaros.org/ for the most complete and accurate 1st gen Camaro info around. The site can be a little difficult to work around in, but it will help you find and decode all the castings and dates on the car.