IF your not planning on breaking over 300 if you boost in the future and still have a decent NA then I would leave the stock ls pistons in it and get rod bolts head studs.... valve springs and retainer and a mild cam that can be used on boost aswell as NA. this is not too great but is as close as I can come to what you are trying to get... of course this is if you are on a budget if money is not a concern then I would decide right now whether I am doing boost or all motor and go all out.