426 still missing after an inframe overhaul

First post here but I figured some of you guys would be more familiar with this motor.
I drug an 8030 out of a barn that has been sitting since 2004 and don't have any idea of how it was running when it was parked. I decided to do the overhaul because it only had 50psi of compression on #1 and #3.. so, after I tore it down I found lots of broken rings. Went ahead and had injectors tested and a valve job done on the head also. I got it all back together today and fired it up but it's running very rough and seems that #1 is hardly doing anything. So, I swapped #1 and #6 injector and the miss stayed on #1.. I then did a compression test on #1 and #6 and they both were at 200 psi.. I'm thinking I got pump problems but it seems odd that a rotary pump would pick just one cylinder to act up on? Maybe because it sit so long in that spot that something rusted around that port in pump? I also checked the timing and it is only set at 10 degrees which is way low but I don't think it would cause it too run rough? Has anyone seen a ambac pump act like this?
Sorry for the long post. Thanks

A miss on one cylinder is probably not the pump, unless something in the hyd head is eroded away. Very unlikely. 200 psi is not nearly enough for a diesel. Should be at least 300, but 350 is better. Comp test another good cylinder. Maybe your gauge is just not accurate. You want to check the pump, take the injector out, turn the injection line away from the engine, or get a spare line, and put the injector on the line, and see if it will pop the injector while hanging on the inj line. 

I did set the valve lash at .15.... with engine hot, those are the specs that came with my overhaul kit. Does that sound right?

Ciould it be a cam lobe wiped?

This is kind of a long shot, and doesn't completely fit the symptoms, but I have had problems with the 426 engines, cracking exhaust valves, after having a head done. Whenever I had a head worked on, we always had the exhaust valves replaced.

Make sure you put washers on bolts that hold injectors in place. After a neighbor overhauled my 185 he left washers off one cylinder and it would miss. He figured out the problem. Put washers on drawled up tight and it worked fine. Bill

That would let you know if the cam is going flat.

being off time is a huge deal to a diesel. Spec is 19*, and I'd rather see one timed slightly advanced in stead of retarded. 

Your headgasket will live better if it is timed at 18    That being said the intravance has to be working correctly for it to burn clean, a lot of times a worn pump wont advance correctly and will make it smoke and run hot and sound like crap. When it comes down to it these AMBAC 100 pumps are a POS. I have 2 8070s one with an AMBAC and one with an A series inlne on it, both set to about 180 HP and there is no comparison between the two tractors when it comes to governor response. The AMBAC has to have a 2-300 rpm droop to get full fuel, the inline only needs about 50. And the inline will probably run for 10,000 hrs vs 3000 hrs from an AMBAC.