If you have a volt meter or test light, putting the 3 lever light switch in blackout headlight position and checking for power at one of those wires will tell you that part...
The hose with the bolt I think is the PCV valve hose...if it is, then it hooks to the side of the oil fill tower on top of the valve cover at the front.
The one at the firewall. the only vacuum line going into the truck is for the wipers. Is there a line on the top of the vacuum pump hooked to the wiper port? If not, then thats where it wants to go...if so, follow whatever is hooked there and see where it goes. If you look down at the top of the fuel/vacuum pump, next to the port on top of the unit, cast into the housing it says manifold on one port and wipers on the other.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!