£500 is not bad for labour but as everyone else says its the pissing about that takes the time when we did my first one it took 12 hours stright from xr3i to zetec and that was drive in drive out lol.
Not a great deal of point buying a donor car if you want to go 2.0 as you will have to buy a mondeo then an escort so you have the right sump oil pickup and flywheel.
Then you got the addition of a new clutch water pump alternator bracket the list soon adds up and so does the cost then you should really uprate the brakes to go with it too.