The rusted areas on the rear seat brace and under the package tray may be an indication of a leak from the top of the rear window seal. Here is a picture I took of the same area during the restoration. I would check with your local junk yards.
I purchased a dash from
Mr. G's Fasterens, they work on a core exchange.
The dash cluster I did myself, you can find the new lenses, the clock was purchased from The Parts Place on a core exchange. The speedometer was rebuilt, zeroed and calibrated locally.