IMHO if going to an after-market block is to be considered an upgrade, to our performance engines, (and I bet World wants us to see it as such) then why would we spend that much money to upgrade to a block fitted with fasteners that could unravel it all?
Consider the upgrades folks here put into the main caps on factory engines, alum main caps, girdles, etc. It is obvious to me we would want the best fasteners in our new after-market blocks. Adjust the selling price accordingly. The Mopar blocks are already more $ than Ford and Chevy.
But wait! They knew it! They did put ARP nuts on them!