Need some ID's

I'm in the midst of transferring most my 1969 barracuda, into a 1975 duster. In the duster there's a vent system hanging from beneath the dash. I like the way it looks as opposed to the bare 89 Barracuda. Although I think ( I stress ) some of the air doors are vacuum operated. I'd like to keep it for heat/ defrost use only. I don't intend to install air conditioning.
In the engine compartment are a few unfamiliar components. I figure if I can I.D. the stuff I can decide weather it stays or goes. Can anybody explain any of what's in the photo ? Thank you so much.

http://www.forabodiesonly.com/mopar/showthread.php?t=250269