Here's the thing! Yes, the engine needs work. The questions back to you; how much oil does it use? Are you getting the car REALLY cheap? How will you be using the car? How well does it run? How easy does it start when COLD?

The first question will be the toughest to answer. Unless you drive the car for a few weeks, you will have to take the word of the seller who may not even know, and if he does will he tell you the truth?