The factory stretch bolts are fine for most applications. They do not require re-torquing.
The "stretch" provides enough clamp force after the engine has been through a few heat cycles and the gasket compresses fully.
If one uses ARP studs re-torquing after a few engine heat cycles is necessary.
Head gasket failure will result if one does not follow a re-torque procedure when using the ARP studs. I wish ARP would provide the re-torque recommendation. Most race engine builders re-torque the ARP studs after the initial engine warm up period.
Warm up engine to operating temp. Allow to cool down, and re-torque the ARP studs.
With the CVH 60 ft lbs is used.

Hope this helps.