I don't think you need to worry too much, it's not like you're just going to blow a head gasket all the sudden. My truck still has the stock head bolts, and I have the non-wastegated Banks turbo from the late 80's. My truck also doesn't even have a boost gauge installed. It might sound like a recipe for disaster. The truck does leak a little oil and I suspect some of it could be seepage from the heads on the back cylinders, but it's not something I am going to address until it becomes a bigger problem. I have put 15k miles on my truck since I got it and I haven't had anything happen yet.
I have to admit that I was concerned a little when I first started reading threads. What eases my worries a little is that my truck was previously used to tow a 5th wheel cross country and what not. In that respect I think the stock head bolts have held up pretty well all things being equal. If I ever did blow a head gasket, however, I would most definitely have studs installed as well as consider a wastegated turbo like the Banks Sidewinder. I say just keep driving your truck and deal with any issues if and when they arise. Believe me, there are a lot of things I would like to do to my truck, but given how infrequently I drive it, it doesn't make sense to spend that kind of money on it. That is why I rather wait until something like headgaskets becomes a problem to fix it. Others might feel differently, choosing to install studs before it ever becomes an issue. If had the money and a place to do it (house instead of apartment) I might actually take that route. It all depends on your situation and how you plan to use your truck.
and 7/16" diameter bolts for a 6.9, a 7.3 has 12 point bolts 1/2" diameter...
