Ok

You'll want the engine (obviously ), looms you can either go for a MK4 EFI loom (you will lose your auxiliary warning system and have to change plugs for stalks) or use a Fiesta Turbo engine loom and patch into yours, you can choose either between OFAB or OFAC ECU's. You will need an RST exhaust aswell.

If the car is already injection it wont need much else.