The issues that Shiloh had (your first link) and the core shift (your 2nd link) were the first version of the block. As I mentioned before, the v2.0 is vastly improved. Those issues where, after all, about 8 years ago.
Do you know the approx. age of the block you are going to be working on?
You may be well served to call Randy Harshman at Harshman Automotive. They have machined a bunch of them.