ST170 engine with some throttle bodies and an exhaust vernier, plus some management. If the management can work the VVT, use it. If not, convert it to use a vernier also. As i understand it, the st170 manifold is pretty good, but you can get fairly good gains with a larger exhaust system. Should be good for roughly the power you're after. You can always replace the exhaust cam and work the head a little for better results, the exhaust valves and ports on zetecs are pretty small so could be reworked, but i wouldn't mess with the st170 inlet port too much.