Is your setup steel running on steel? If so not a good relation. I would have the rockers honed out and get new shafts. And make sure you have at a minimum of .003 clearance. As madscientist says if the don't have the banana groove. You can grind some in with a small grinder and a cut off wheel. They don't need to be very deep. Also, if this is a hydraulic lifter street car. 440 source aluminum needle bearing rockers are inexpensive and good item.