I would NOT pay book for this truck....bullet proofed or not...many many many examples of Bulletproofed trucks needing to be re-Bulletproofed...
Head studs or not...nothing changes the fact that there is only 2/3 of the clamping force holding the head to the block as every other diesel... stabilizing the head to the block is not an easy task. Never mind the fact that everybody who does bulletproofing on a 6.0 does it a little different.
For me to consider this truck I would have to see evidence of the following.
1) BPD EGR cooler (walk away if the EGR has been deleted...not just for EPA reasons either)
2) brand new FoMoCo oil cooler with FoMoCo gaskets
3) New or professionally resurfaced heads (very hard to resurface these heads without experience)
4) new FoMoCo head gaskets
5) professionally cleaned or recently replaced turbo
6) documentation of what fuel injectors have been replaced (highly likely)
7) documentation of regular fuel filter changes (there are two)
8) presence of an engine coolant filter
9) presence of a new coolant cap
10) newish batteries
11) presence of some kind of engine monitoring system
12) spare 5k in savings for the inevitable FICM and or fuel injector failure and or HPOP
If the motor has all this and skipps or stutters at idle (even with all this work) walk away. If you see any white smoke...walk away...if you get the gut instinct that something is off...walk away...if the motor is warm when you get there...walk away.
I'll let someone more experienced than myself talk about the FICM problem.
In other words...I recommend looking for a V10 gasser or a Duramax or Cummins during this era of truck.
And this is coming from someone who really enjoys driving a well running 6.0...but I will not own one...way too much risk with not enough reward.
Good luck with your decision.
Thanks!
Jeremiah