You will be very much on your own with the electronics side of the conversion. It's pretty unusual to keep the oem injection due to the power restriction and the complexity.
It can be done and I could give you the info on a proper zetec but you will need to be very confident with auto electrics to to it.

I am just about to start a rwd st220 engine project on its own ecu but I have done dozens of other Ford's on oem injection.