Curious, how do YOU check valve guides with the "wiggle" test?

The reason for fresh correctly sized guides as a precursor to the valve job is that the high end valve and seat machines need a straight guide to do their job properly. You can't get a good seat of angles cut if the pilot can't be centered because it's rattling around in a loose or tapered guide.
The key to power in any Mopar shaft type head is the quality and accuracy of the valve job.