Wiring A focus 1.6 zetec

[Darryl]

Hi there,
I was thinking of buying an engine and was wondering if I buy a focus engine (1998) 1.6 petrol zetec) do i need to also get the ecu and wiring loom?
If i put carbs on the engine, would i need any of this? or how much wiring is there to be done to it to get it going?
Thanks very much,
Darryl.