Trying to get the heater working

'74 Dart, 225 /6, A904, Factory heat/AC. Fall's coming and starting to get cool so I need to get my heater working. Pick up the grandkids from the babysitter every evening and can't let the little one's be cold now can I? PO says the heater core's been replaced and with the condition of all the heater/AC stuff I'm inclined to believe him. Here's what I know:

Blower motor in engine compartment firewall is not factory and not plugged in. Squeals loudly when power applied. Probably has wrong fan cage. Can't find the plug in the harness.
Hoses in the engine compartment look recently replaced but are not connected and water pump is bypassed.
No control valve in heater hose.
Driver's defrost hose is connected, passenger's was in the trunk.
Switch/selector appears intact although connections are questionable.
There's a few wires under/inside the dash that are not connected.
Dash pad is not bolted down and easily removed.
Vacuum pot on driver's side of the AC is loosely attached. Small panel it attaches too appears to be floating around? Does the pot attach to a small panel and then the panel attaches to the case?

I've studied the manual and have an idea of which way to go but I have a couple of questions.

What does the blower motor plug look like? Is it just 2 straight spades parallel to each other or at right angles to one another. The latter is hanging loose in the dash.
The control valve does go in the inlet hose in the engine compartment and not in the interior somewhere, right? And it's a vacuum operated, normally open, valve?
Anybody got pics of the AC/heater box so I'll know what's connected or not connected or missing? Especially the back side. I shouldn't have to remove the box to hook up everything should I?
Anybody have an exploded view of the whole assembly? My manuals scan are pretty dark and can't see much detail in the pics.
Any and all input, advice or pics are greatly appreciated!