Get 3 cylinder carby engine from junkyard and get rid of all this swap hassle. Bad swap will become a headache. Placing ECU will be another mess. Besides complete swap will be expensive. That will include complete assembly, throttle, injectors, gearbox, clutch plates, fly wheel, wiring, ECU, hoses, all sensors, fuse box upgrade, and so on. No ordinary "my mechanic" type mechanics can do all this. But those junkyard people do know workshops where successful swap of such level can be done. But consider first option and avoid this swap or may be sell the car.