service manual

Cuda Al said
Reprint
1965 Plymouth Service Manual Shop Repair Barracuda Belvedere Fury Valiant Reprin | eBay

Original
MoPar Technical Service Manual - Used - 1965 Plymouth | eBay

There may be others, these were the first I found.

Alan

Or, you know, just click this link and get it free.

https://www.mymopar.com/downloads/servicemanuals/1965_Plymouth_Service_Manual.zip