try a 4l barra motor from a XR6T ...the Aussies know what i mean.......
Barra 325T FGX Sprint
The final variant of the 4.0-litre I6 cylinder turbo-petrol engine featured in the FGX XR6 Turbo Sprint. The engine employs an over-boost feature for 10 seconds when optimal atmospheric conditions are met when under full throttle, boosting power & torque to 370 kW and 650Nm.
Power: 325 kW (436 hp) @ 6000 rpm
Torque: 576 N·m (425 lb·ft) @ 2750 rpm
i've attended dyno days and seen earlier barras pull 1k hp ...on a stock bottom end!!!