First off, don't buy an eBay kit. You're better off piecing together your own, or buying something thats already been done for you, like a Greddy.
In terms of the power handling capabilities of your engine, it all really depends on the tune. You might get 200whp safely, you might get 130whp and have parts and pieces flying everywhere in a week. You definately need to do some researching. Do you know what size turbo you want? Whats your budget for this project?