I am building a 500+hp Z car that should run atleast mid 11's. The reliability is easy to have if you can pay for the necessary hardware. To produce this power reliably you will need the following:
raceprepped rods and crank
ARP Bolts and studs
HKS metal head gasket
good engine balance and machine work
Fuel management is imperative to reliably maintain these hp levels. If you want specifics you can drop me an e-mail.