Used T25 turbo setup?

Since I only have the cash to buy a det engine, and not have it put in... I would like to find a quality used turbo setup from the bluebird, one that has the manifold, J-pipe, and injectors with the turbo. My G20 has about 120,000 miles but it was well maintained, does this mean that my stock couldn't handle the addtional power? Thanks.