no cold start...ready to snap

[alberta 7.3]

Okay, my 2000 F350 has me at my wits end.
rebuilt engine (deglaze, new rings, bearings and seals)
new HPOP
new CPS
new IPC sensor
glow plug system functioning (good plugs/relay, draws about 175A on activation)
new fuel pressure regulator
new fuel filter
tested fuel pump at pump outlet, pegs a 100psi gauge
fuel lines clear
full tank of fresh fuel
HPOP res full
IPR solenoid replaced by previous owner.

The truck fired fine at my buddy's shop (room temp) now that it is at home outside at 20F, it won't start, the tach bounces during cranking, batteries are good. Yesterday, after 20 min of cranking, the truck finally started. When running, there are no DTC's

[howardtm]

ya gotta plug these beasties in when the temp drops. Last winter..drained my batts a couple of times trying to get my Beastie to fire. No Techie by any defination, but make sure your glow plugs are working and if able, plug in that heater when the temp drops.

[mschn99]

how far have you driven it?? You need to put about 50 miles on that motor after having it that far apart to get the oil systems fully primed (mainly the high pressure oil systems...)