You need custom mounts, gearbox etc if you're transplanting.

The standard engine (IF it's a Zetec-SE, i.e a black top, not silver, as this has differences in the head, and bottom end) is great engine to tune. Take a look at www.ShawSpeed.com/fsigma.htm

This is the same engine as in the Zetec-S, I've just ordered some SS4 cams, shims, HD big end bolts, so we'll see how it is...