Anyone here ever have their pistons machined?

Sledge: It was very considerate of you to put up those pages. I appreciate that.
It looks like that cam card is for a Chevy BB Lunati. The specs for mine are slightly different. The Mopar version has an intake closing of 56.5 @ .050. The Mopar Performance specs on that other page are at a gross number. I've had a hell of a time finding actual specs @ .050 of the 509. The most reliable data I discovered was found AFTER I had swapped in the Lunati. The website I found listed the 509 as having a 58 degree intake closing @ .050. This would explain why the engine knocks more now...It closes 1.5 degrees earlier with the new cam! I would gladly accept the MP specs if they matched the standard of measure that other cam manufacturers use. Some people trash talk the MP cams, but I've ran 5 of them and only one of them went bad.
Since the heads are being ported as we mull all of this over, I'm still going with thicker head gaskets. I like the performance of this Lunati cam. That MP .590 solid has just a wee too much lift for my 1.6 rocker arms. I'm supposedly limited to .600 lift with the springs in the Edelbrock heads and the 1.6 ratio takes the lift to .629. Even deducting for lash, I'm still over the limit. Whats the fix for that? Do the spring seats get machined or is it the top ends of the valve guides?