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If this is a TBI motor it's easy. Just use a noid light to check for injecter pulse. If you have injecter pulse, the crank sensor is good. It doesn't use a pick up coil. If it is only spark your losing, it's likely the module. You can check for pulse at the - side of the coil to find out.
If it's a vortec, you'll have to locate the injecter wire to test for pulse