Download the PDF from the link I posted. The factory service manual for your ‘65 is on that page. Just scroll down until you see “1965 Plymouth service manual”. That will be the factory manual for your Barracuda (and the valiant and a few other models).
If you want a hard copy, you can either print the free PDF I linked or look for a used one on eBay. Heck you could probably even take the PDF version to a copy shop and have spiral bound or something if your really wanted.
