Engines are complex large expensive components so putting to of them in a car would be about the worst thing ever. Electric motors are small simple and cheap. You can hold a 500hp electric motor in your hands and all you need to make it run is plug in a wire and maybe some low pressure cooling pipes. Some EVs have 3 or even 4 of them and there is little downsides to doing this. To make the car AWD you would have to at least have a tunnel and jump inside the car for a drive shaft which is terrible.