The balancer, pulleys, and belts are back on the engine and it is running well. I used the stethoscope and it was impressive to hear the different sounds from the engine block, water pump, alternator, etc. As was mentioned above, I should have been using it at the beginning of the problem. The scraping sound is not there now. I might have able to pinpoint the problem with a stethoscope when it was happening. My best guess at this point is that the sound was coming from the fuel pump. I have a new one on hand just in case.
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