Hi all , complete noob here, need help.

I have MK6 Escort and would like to put Mondeo 2.0 engine in it.

I can get 2003 Mondeo as donor for 500 euros.
The thing is it has 300k km on it. Is it worth it, or should i look for a car with a less km.

Also since i am a complete nooob, i would appritiate any help or guide on how to do it. If some one has done it and has a link or description it would be most helpful.

Thank you in advance