Being 36 years old I doubt there is a pdf since computers weren't readily available then and I would be really suprised if the company had one that old if it ever existed to begin with.
Boats aren't like cars that come with a comprehensive manual, they may have only built 100-200 of your boat and it just isn't feasable to make a manual.
Was there something specific you needed to know?
Thanks for the lecture, but there are devises called scanners and I found the full 800 page Shop Manual plus a copy of the original Owner Manual in PDF Format..downloaded it and have copies of both now.
Bert