Keep the boost 8 MAX or less on stock engine.
I blew my 1st engine when I changed the pulley (running 8 lbs) to get to 10lbs boost, ran her very hard for 3-4 months, then she blew.
On the re-build, she got forged took it up to 12Lbs running a P-Series Procharger , today she is now 14 Lbs...