Was it sitting inside or outside?
I would dump a good amount of oil over both sides of rockers and let it drain right out. Maybe even some motor flush.
I wouldn’t try to turn it over yet. Pull the plugs and fill cylinder’s with marvel mystery oil and let it sit a week.
Then manually try to turn it over without plugs in. If it turns, crank it with no plugs (and fresh oil). Then drain it all again, put in fresh oil and crank again. You may want to add motor flush to help clean it out. Just crank it without plugs and don’t start it. See if oil flows through pushrods.
Finally put it all back together and try to start it. Run for 30-60 seconds and change oil and filter. Repeat this until the oil clears up.
The dust in the oil pan is concerning- hopefully it’s not too damaged.
I know others have said pull it, but if it might be damaged you have nothing to lose going through this process other than $200 in oil and filters.
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