Your truck had a Mid-Mount pump with a transfer case that would disengage the rear and engage the pump for stationary pumping. The parking brake had to be on the back side of the transfer case so the transmission could still turn when pumping. You'll need to find all of the parking brake parts to reinstall on the tail end of your Spicer.
As 3B said, the extra lines under the hood were pump primer lines...just trace them back to the source, remove and cap. Your 2-speed rear is more than likely an electric shift Eaton, so there won't be any vacuum lines needed for it.
Looks like a big Leece Neville Generator...does it also have the large Diode Rectifier mounted behind the grille?
Post some more pics of the engine compartment for further review.
Mike B
