Also, was there not an aspect of the stretch bolt that was used to take into account the type of head gasket? The standard head gasket is more compliant than a MLS one, so maybe the bolts need to conform to that?

Either way, we know standard works. There have been very few cases of failure at the upper end of the scale, as testified by me/Karl/Tim/Rick etc, but plenty of cases of head gaskets failing when MLS/ARP are used.

I hope I don't have to dish up an 'I told you so!!'