Help understanding the engine bay

Hey,

So I picked up my first classic -- 73 Duster with 360. It's pretty rough and I am trying to figure out the pieces strewn about the engine bay. Any help appreciated...
Also, I know this is super basic stuff but I don't know anyone to ask.

Each question has a photo associated with it (except for engine bay wide shot)

What's going on with blocked caps on my intake?
Where should I mount the coil?
And what's this on my radiator?
These plates on the passenger side firewall with the tube mounts, what are they?
What is this thing I'm holding with the orange tube and the wire on top?
Where do I find/mount the tubes that run to my heater core?

Thank you for any help!
Ben