Thats a tough one. You dont want to do any machine work...that limits your possibilities alot. Adding a turbo is great, but you still require some work. Fuel delivery system, retune the computer, open up the exhaust system. And even with that you'll be limited by the camshaft, cylinder heads ability to flow, bottom end of the engine and fuel delivery system. Horsepower costs alot of money and if done improperly...will cost you a whole lot more. Theres alot of power available in a 350...but you have to put the internal components together to bring it to life.