Are the Hyundai cars MAF or speed density systems? If they are MAF, i`d recomend you get a manifold to work first. Then use the complete engine wiring loom, engine sensors and ECU from a manual hyundai doner car.

You would need:

Water temp sensor
Air temp sensor (probably buit into the MAF sensor if its MAF based)
MAF or MAP sensor
TPS (throttle position sensor, will be on the TB on the manifold)
CAS (crank angle sensor)
Sync sensor (driven on camshaft)
Oxygen sensor
Baro sensor if fitted
Ign coil/s and modules

You will have to run a return fuel line to the tank from the pressure regulator
and mount a high presure fuel pump.

The hardest bits will be to modify the manifold to fit and mounting the crank and cam positon sensors.

If the doner car is MAF it may run OK. If its MAP(speed density) you probably wont get it to run very well without a lot of headaches or changing to an aftermarket ECU.
Im not sure if its possable to reflash the Hyundai ECU`s