I have a factory GM service manual that covers 70 full size Canadian Pontiacs and Acadians. It is in very good to excellent condition for a used manual that is 45 years old. The binding for the pages is nice and tight, and it's not torn or full of grease marks like lots of manuals that come out of dealerships.
This book is a must have for you if you are doing a 70. It is full of specifications and repair info such as torque specs, electrical component rebuilding, wiring diagrams etc etc.
I would like to get $25 plus actual mailing costs (likely in the 15-20 dollar range in Canada) for this book.
Enough of my sales pitch, here's photographic proof!