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Studs are 450 -475 from horsepowerfreaks.com or long island performance diesel. Gaskets and fire rings are also available from long island performance diesel. I recently put on a new head due to a cracked one and put on new stock head gaskets and arp studs from horse power freaks.
I would say use stock gaskets with the ARP studs, if 500rwhp is all your looking for. The reason Hypermax don't want you to use ARP studs is if nothing is able to "give" you end up replacing the rotating unit if you over boost the engine. I won't tell you my source, as its irrelevant, but bending all 8 rods is no joking matter.
But that is exactly what I want... not to ever have to worry again about a blown head gasket... what a waste of time and fun!!!!
And... at what HP amount do rods are required?
99.87% of the time you will not have an issue with the above mentioned mods as far as what your wanting to do with your truck, however there is that .13% chance of an "Oh Chit". That is just part of the performance game. Me personally, I'd live with a set of headgaskets in case of over boost, long before I could come up with the money for a rotating assembly. Just something to ponder.