The machine shop that does the boring, will have the tools to measure the bore u and can tell how much it will need to clean it and straighten it up. Then order the piston, they wil need it to finish the bore to the correct size and gap the rings.
Ken

 

thanks for all the help. had it checked 20 over is perfect. they found a few dents on top of cylinder next one of the water jackets so now im just waiting to get the top shaved a bit then bored and should be going i will let u guys know