If you're going for a stock NA build with only basic boltons then I wouldn't worry about new rods unless you pull them and can see physical damage. Pistons might be a different story, check for damage ans signs of cracked ringlands. If your block requires overboring then you'll have to replace the pistons in order to fill the gap. If the cylinder walls are fine and you can just get away with a quick hone so that the rings will seat then you don't need to replace them.