I wouldn't bother mate. Look at everyone who's run a turbo'd engine with that running gear. All you'll hear about is broken trasnfer boxes.
Alex recently built an RS2000 4x4 (same running gear) with a cvh turbo. Didn't last long before he was needing a transfer box
I think you will find that the gearbox and transfer box of the mondeo are different to the escort stuf and as such are a lot stronger too, also the rear diff is different and as I am reliably informed very strong compared to the escort.
The mondeo transfer box is actualy a lot stronger as tested in one of our escorts with 300bhp and like I said previously there is an escort in germany running 450bhp from a zetec turbo and with a cooler on the transfer box it has lasted very well so far.