500hp 5.7? Whats it take?

If you're already planning on an aftermarket ECU, why not just put a turbo on the stock 5.7 and be done with it? Then you've got room to grow if you ever build a good motor.

Well the plan was to get it going n/a then save up for the turbo stuff later. Boost and cast rotating assembly scares me but I know people are doing it. What will they handle? 7lbs?