look at the piston ring box see if it says STD. or .030 anywhere on it. but since its bored .030 over your going to need .030 over rings and .030 over pistons. and denny has posted the right way to check your ring gap but otherwise the way you checked it you should get anywhere from .002 - .005 for checking the ring groove. I would think there would be some sort of specs & instructions with the rings but i could be wrong.