i heard about all the y8 problems when going boost im looking to be on the safe side since im using stock internals....... 8psi with a t3 .42/.48 possible 10 at the track

Arp heads studs?
Headgasket do not know which 1 to buy i heard of using 2 oem gaskets
block guard?

will this put me on the safe side with a good tune for a few months till i compelete my short block?

 

If your gonna go through that trouble for a few months, don't.

All of the stuff you listed isn't going to make it worht it. y8 can see 10psi easily if you tune well.

 

so im better off just leaving everything stock?