If you do it right, you can get a reliable ~400 horsepower to the wheels for around $8k.

The trans is the main factor to reliability.
Ported heads
Headers
Cam and install parts
Blower Porting and pulley drop
fuel injectors
Tune
Intake
Colder Plugs
etc.

Or just do half of that and go to a dynojet and get some "bragging numbers".