I wouldn't worry too much about stock internals. I have a completely stock LS making about 320 whp and 270 lb/ft of torque. Tuning is the only reason why that setup runs so well. And whenever I can datalog I'm probably gonna push it a little further (300 ft/lb sounds nice), considering I kept it real conservative not being able to datalog. I wouldn't limit yourself to saying how much boost you would run, just tune by power. Boost is realistically irrelevant.