If you think the '70 parts book is bad, you should see what they're like nowadays. Rear body panel for an '07 Charger isn't shown or listed; you have to turn the VIN filter off and order one for an '06. Many Sprinter parts are not listed, side panels using VIN often are wrong, etc.
I spend hours per week helping the Parts guys find the parts I need. I don't think the parts books are always unassailable as far as accuracy.