Buttoned everything up over the weekend -- primed the fuel filter, connected up the oil bath air cleaner, and new coolant hoses and clamps connecting up the radiator. After fixing an unexpected waterfall from the thermostat housing (make sure that O-ring is in the right spot, oops), I connected up the battery and finally tried cranking the engine. Nothing. All the lights turned on, what could be wrong? Well, I missed the battery ground cable bolted to the transmission. Tighten that down and it cranks! After bleeding the fuel out of the lines and replacing the old corroded ground cable with a new one, it started right up with a satisfying clatter: https://www.instagram.com/p/B2NsjzklqgX/

I'm going to run some diesel purge through it, adjust the valves again, and then try and even out the idle. I'm planning on checking the fuel pressure, compression, injection pump timing, and cleaning the injectors. Anything else?