Would be much better getting the head rebuilt with new seals than trying to fit an old 1.6 Zetec in and trying to get that work. Also the hassle of if you ever try to sell the car explaining that you fitted an older engine in, I wouldn't buy it I know that.

Bottom ends go because people abuse them, dont service them or let them run dry of oil. My engine revs right round to 8400rpm with no problems what so ever! (not a standard engine any more though - lol)