There is probably no bench test for a coil with an internal crack. Only way to test that would be with an oscilloscope while running.
An automotive oscilloscope is the BEST way, but not the only way. And not many folks have a suitable 'scope.
Did a quick search on how to test with an ohm meter, low side is reading .5 high side is reading 8.34 . I do not know if these numbers indicate a bad coil on their own or not because I do not know what they should read. I do understand that this test may not be absolute .
The practical way (no oscilloscope) way to test a coil is to first make a visual examination for cracks/carbon tracks, then perform all the ohmmeter tests, then verify spark power using a spark tester calibrated for HEI ignitions.
If it passes ALL the visual and ohmmeter tests, AND can reliably fire the spark tester (preferably with the coil hot, and misted with water from a squirt-bottle) then the coil should be good.
Ohmmeter tests--specs are in the service manual:
Primary resistance
Secondary resistance
Primary to ground (should be infinite resistance--open circuit.)
Secondary to ground (should be infinite resistance--open circuit.)
SOME coils have the primary and secondary windings entirely separate; most coils have a connection between primary and secondary, so there's only one "ground" test needed.
The spark tester needs an
actual spark gap. Avoid any "spark tester" that makes a light-bulb glow to indicate spark power.