i think you'd be okay with just lowering the C/R using g60 rods and pistons, should get away without using the uprated crank. your standard gearbox/clutch probably wouldnt last long, and your brakes would be as much use as tits on fish. so then the 'charger, piping, throttle body (i think?) intercooler and ecu from a g60 and all the building.. it'll probably end up cheaperto source a complete g60 engine.