I would just crank it up and run it.
There is no need to be messing with seals, gaskets, and such unless they are actually leaking, which I doubt.
All the wires hanging on a 1st Gen. Cummins are there for such things as the gauge senders and such.
The water-in-fuel, grid-heaters, fuel-heater, and such can be discarded.
The only two wires necessary for it to run and drive are the one that actuates the fuel-solenoid and the one that powers the KSB valve located on the left side of the pump.
You can gut the fuel solenoid and do away with that wire.
I would check the oil, prop it up where it can't fall over, connect a battery, and fire it off.
I started and ran mine sitting on the floor many times before it got installed.