wiseco pro lite forged pistons for sure. as for the boring, i would just take the jugs to a machine shop and they should be able to tell you how much you will have to go up. if its just cylinder scarring you shouldnt have to go up to .080 over. go the least amount you have to so you can still have more bores for next time. once you get her all back together you need to make sure you get your carb jetting dialed in if its not already. im sure the 91 octane gas was bad for it but i bet your running lean as well