If you're doing a stock rebuild, go with the LBZ rods and have your pistons delipped. An LBZ rod will definetly hold more power....but it's still a stock rod.
LBZ rods can hold about 100 HP more than LB7/LLY. If you going to stay with a single stock cp3 you'll be fine to go this route, if your planing on dual fuelers you could bend them easily depending on tuning.