To run a Gotech Pro or a Pro-X you can use a 1.6, 1.8, 2.0 Zetec flywheel or an EFI CVH flywheel, you use the standard Ford crank sensor.
Gotech is supplied with an almost fully terminated loom.
You can get rid of all the old engine loom and ECU.
You can use the standard water temp sensor in some application and use the Gotech supplied water temp sensor in the other applications.
As said before you can use high and low impedance injectors.
Use the standard Ford coil pack.

Any other questions feel free to ask.