The oem 6 bolt head bolts are quite strong, not much of an upgrade going to the ARP 2000 studs. The 7 bolt are a different story, they are smaller and a different type of bolt.

Rod and mains I would definitely consider ARP hardware for a high HP build. It's well known a lot of 7 bolt rod failures stem from the oem rod bolts stretching.

One place I do not use ARP is in the exhaust, while they are strong, the material they are made of ends up galling very easily and quite often destroying threaded holes. The SS studs for the head to exhaust manifold have a bad tenancy to loosen, so I stick with OEM here as well.