Drain the oil and let it sit for a day or two to see if anything settles out in the bottom of the pan. There can be a lot of metal in the oil and you won't see it on the dipstick. Look for a silvery-metallic sheen to the oil when you drain it.
Also cut the filter open and look for particles. Problem with that is if the pump stopped pumping prior to there being any damage then nothing would've gotten trapped in the filter. If there are particles in the filter then you know for sure you have bearing damage.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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