you already got the kit and now your reconsidering? well if the engine stilll runs well and holds oil its probably good to go. if you wanna be thorough then check the compression in all the cylinders, and if its not up to spec just rebuild it, or have the shop do it. it wont be as much as buying a new car, and when you put that turbo on, itll be just as fast as anything you could buy. just my 2 cents