So it really sounds more like an issue of torque repeat-ability, not torque capacity.

If I found any significant corrosion on the bolts, I'd replace for sure. But they clean up perfect. On the previous install we chased and cleaned the holes in the block and moly lubed threads and under the bolt head. That truck is running like new 1000 hrs later.

Not cleaning up the threads in the block is probably where a lot of people go wrong.

At 65-70 ft-lbs (IIRC), the clamping force is actually pretty low when compared to other engines I've worked on.

Obviously it ultimately becomes a question of risk. In my situation, I'm the end customer and can assume all the risk. I'm just trying to assess it, and right now I see it as being really low.