pistons and rods for sure... and if i were you i would do the valve springs too, if anything get them from a GST or a GSX... they have stronger ones so you wont have the chance of getting valve float and possibly bending valves! other than that everything else is fine! and since you already have the motor apart replacing the springs why not do the valves and cams... unless you really cant afford the extra 5-600, but it will allow you to flow a lot more boost!