Hello all

Ive got a rs 1800 engine (130 bhp) that I’m dropping into a Mk3 fiesta. It’s missing the ecu and loom. Does anyone know which ecu and loom I need and where is best to find one?
Is there an ecu from another engine that I can use or is it specific to that engine?
i usually work in carbs so injection is new to me.
many help would be massively appreciated.