2000 ford excursion 7.3 L diesel won't start?

We replaced injector cups, under valve wiring harness both sides. New starter. Batteries are good and charged. I'm at a loss as to what it could be. Any suggestions would be great.

When you removed the cups you know that motor oil and diesel fuel will spill into the cylinders. Are you having a problem with hydro locking? Or it cranks but will not start? You may need to purge the air out of the high pressure oil side.