Heres your advise, don't bother, just go out and buy a V6 mondeo, it will costy you more for the pricer of the engine and labour.
You can pick mondeos up for buttons these days.
If you are after a quick one get the turbo diesel, they are rapid, the one with the 6 speed box that is.
To do the engine swap you would have to...
Change wiring loom
air flow meter
the list goes on, just buy one mate and save yourself a lot of time and money.