Thanks. Yup should be 978
Assuming you are on this page
Parts Manuals – MyMopar
Roll over the link for 1970-71 and it should show that its a zip file.
Depending on you're web browser, what usually happens when you click on the link is a download box opens and asks whether you want to open it or save it. If save it, then where. As a zip file, the browser probably can't open it directly.
Download and go to where ever you've saved it. Then open the folder and double click, open or 'run' the zip file. Then you'll ge the pdf which can be opened with acrobat pdf reader or eqivalent. (If your computer doesn't know how to open the zip file, it will ask you what program to use.)