Looking at new injectors, input needed

[Tilt]

Tried to start the truck for the fist time this week. After a couple of self inflicted hurdles, I got it to turn over, but it would not start. Bled all the air out of the fuel line, Have 55-60 lbs fuel press during start up, checked all injector signals with a noid light (all good) and have spark on all cylinders. I pulled the injectors yesterday and soaked them in Seafoam for a while and sprayed out the fuel rail. After soaking the injectors, the truck will start with starter fluid and will run rough but will not idle. It will not start without the starter fluid. I also noticed that only 2 of the header tubes were getting hot (roughly 500*) all the others were 160*-260* shot with a temp gun. The harness is a new BP Automotive, andd he also did the reflash on the ecm, so I am assumiing that VATS has been removed. Engine is a 2004 LQ9 with 243 heads and a new cam speced by Martin at Tick Performance.

Now to my question. I'm looking at just getting new injectors instead of messing with these originals. In my search the AC Delco 17113698 comes up as factory replacements. I found these on Ebay and they say new condition, but the price is half of what i have found elsewhere. http://www.ebay.com/itm/ACDelco-1711...-/350617736602
Has anyone else tried these? I'm just a little leery about them being fakes or something. Are there any better factory replacement injectors that I need to look at? I'm hoping to get some ordered tonight or tomorrow.