It all depends on what the engine is intended for. (Sorry for the wishy washy answer.)
If you want to build a motor on the level of a Coy Miller Stage III then the extra strength of the ARP bolts (head and main) are probably needed. And a stud griddle as Larry said.
If you want to build a totally stock motor, then, (IMHO) they are not necessary.
If you want to add some bolt ons, say a larger MAF and TB along with some headers. (IMHO) Probably not.
If you are adding the MAF, TB, Headers, and a 10% blower OD. Then they may be worth the piece of mind.
It is a judgment call.
Acronyms defined:
IMHO= In My Humble Opinion
MAF= Mass Air Flow sensor
TB= Throttle body
OD= Overdrive