Agreed^^
Its far from the most difficult conversion out there, but its still a fair old thing to tackle. And if you have to ask others whether a 300km engine is suitable or not suggests you're not going to get too far when it comes to the actual mechanical work (no offence intended - we all started somewhere!!)

If you are truly wanting to do a conversion, then start with a 2.0 Silvertop (Zetec), again from a Mondeo but earlier marks. Its the easiest conversion known to man, is dirt cheap to do, and is documented thousands of times over the internet. Its a nice little gain especially if you chuck some cams/decent manifolds etc on at the same time.