I have fitted ARP studs to hundreds of engines, never had a failure or thread pull and I have a thread somewhere here where I compared the values of the TTY bolts vs studs and their final lengths (post stretch). lets just say for me, TTY bolts scare baby jesus. I used the original early set of studs in my 4.6 without issue, the thread IS long enough to bottom out, Loctite SHOULD NEVER be used, only the ARP lube, 80 lbs is fine AS LONG AS YOU FOLLOW THE PROCEDURE. If you shortcut it they will fail prematurely. I have tested this with a bare block, tin & comp gaskets and 8 sets of TTY bols and 4 sets of studs.

