I have a 2001 A4 2.8 Liter 30 valve engine that the water pump seized on. I may be able to get a full car 96 A4 2.8 L 12 valve. That's just missing a transmission. My question with the whole car at my disposal can I swap the 12 valve from the 96 to my 2001 car and get a working car. I know the bottom end of the engines are the exact same but would it work and how hard would it be? Thanks all!