taking a tq reading off a stock head bolt may not be accurate since they are tq to yield. With that said on new installed stock bolts i have found around 245 so same as arps. Also take into account that not all tq wrenches read the same accuracy, etc.
Anyway as for head studs i would also question how many retourque thier head studs.
I will tell you my scenario. I tourqued my head studs to 260 ft.lbs. however that was at the limit of my tq wrench so that is not the most accurate area of a tq wrench. I double checked it with another tq wrench. I ran a heat cycle and rechecked = no movement.
I then used my truck, towing , etc. I do not race my truck or run any hi power tune or anything like that, but like i said i do tow.
Anyway jump to nearly a year later, i filled up at a local fuel station and they had made a goof and had gas in their diesel and diesel in their gas. (delivery truck got it bassakwards)
So the result was 8 new injectors and retourquing of the head studs while i was in there. This time i tq my studs to 245 using the same tq wrench and guess what, some of them moved and were undertorqued.
Now sure i guess some could say me overtourquing stretched them, but an extra 15 lbs is nothing considering a tq wrench is not even that accurate at that tq, aswell if arp's can't take a little extra then whats the point.
Bottom line is my head studs required a retourque after i worked the engine. (which is why ford and other manufacures went to a tq to yield bolt in the first place)
my truck does not puke a bit with studs, but no racing just towing continous loads for a few hours at a time. So at this point i feel a retourque of head studs is required, but thats just me.