Looking for 64 Cuda wiring diagram or shop manual

robcuda said
Is the wiring on the 64-65 identical? Or were there changes made

I don't think so. '63 and '65 have a different bulkhead connector than '64.
By '65 fusible link was implemented. Here's the page Electrical Accessories & Service (Session 207) from the Master Technician's Service Conference
Most all of the Master Tech Conference is at mymopar(pdf) and the Master Technician Service Conference - Chrysler's Training for Mechanics Imperialclub (html/jpg).

Bishko is a retailer of old and reprinted shop manuals and related literature. They probably will have the manuals you are looking for.

Another great resource is The 1970 Hamtramck Registry Library Page (1960 - 1964)
Unfortunately no TSB in the collection for '64