73 Fury Speakers

So, how many speakers should my car have from the factory? It looks like someone has done some modifying and I'm trying to set it up correctly.

How many should be in the dash? One I think?
How many should be in the back?

The front speaker in the dash seems dead. I'll need to replace it with the one from my spare dash, which looks like it'll be a trip and a half.

In the back I currently have three, but only one was hooked up (the forward facing one on the somewhat left of the rear seat) while the other two (upward facing) look somewhat newer and had new wiring running to them but were not connected to the radio output at all.

Lastly, assuming all three rears are factory, how should I wire them? Parallel, series? I know with radios you need to watch for dropping your ohms too low and cooking the radio, but I don't have real world experience in avoiding that.

:sSig_thanks:
Author: theos911