Nice Z. Which oil to use has been absolutely beaten to death. 10-60 or 15-50 if you are tracking the car. Some of us on here have learned the hard way. Personally, the first two things I would recommend is the exhaust hub and rod bearings. If the previous owner was running 0-40, then I would be suspect of the bearings and there is no way they did the hub if they were running 0-40.
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