Help identify please: power or manual gearbox?

Wow so many replies with awesome info! Thanks! The links and pictures are of great value. My son is right now with my dad at the local junkyard and he found a Polara (I think) with a pump and brackets. I'm sending him all this info so he can try to identify it and make sure it will work. At the very least, it can be used as a core and the brackets will be handy too.