Need help troubleshooting 6.2 no start

[cam.man67]

So you may recall a few weeks back I asked some questions about replacing the injector pump in Whitey, and I got a lot of great answers. Went to Injector Warehouse and bought one, started putting it in last week.

Getting it in was a major headache and I had it out once to realign the timing marks. I thought I got it back together right. I know I've aligned the line on the mounting flange with the line on the engine.

Put it all back together...nothing. I've bled all the injector lines of air, I've got diesel going into the engine no problem (aside from the fuel pressure seeming low at the engine?), but I'll be danged if the engine runs.

I'm very frustrated at this point...I reallllllly don;t want to take this whole thing apart again, but I'm afraid the timing is the culprit. Does this sound reasonable? Any other suggestions as to where to look?