Lol - you think a car yard trying to sell you an import is going to rebuild an engine that is going to ast you a while considering you're on a tight budget. Lol... Take the advice of people who have been there an done that - walk away from it! Seriously, you dont sound too mechanically inclined or knowledgable so I would walk or run as fast as you can...
Then again, buy it and we'll all have something to shake our heads at when you're back asking similar questions when it let goes in a couple of months time.