I had H-11's in my '05 6.0L and we had to "reuse" them 3 times (since the 6L is a POS) and we never had problems.
We uhh....dropped one of those little plastic clips commonly referred t o as "pushpins" down the intake...let's just say she shook a bit when we fired it back up, had to tear it all back down to find the culprit.
Ive heard things about that particular set of head studs...pass on them
If you know where to look you can get them new for $500 to $550.
If you don't mind sharing,could you point me in the right direction.