Is it possible to get the 3.5 603 up to around 275-300 hp the extra torque it makes would be real nice in a heavy car. Do they make stronger rods for it or should i forget that and use the 3.0 603. Are there any writups on swapping the 606 into a w140 chassis. I know the 606 is the best but if its a pain to get it to work id rather stick with the 603