340 oil galley plugs

And excess cranking and bad FI tuning could overfuel the cylinders and put gas in the oil. How were the cylinder bores and pistons at treardown? It would be circumstantial evidence but bore damage has a fairly high probability of showing clear evidence of overfueling the cylinders, especially after 6 hours.

And I hate to tell you this, but the cam may now be suspect; long non-running cranking at start up can ruin a cam lobe and/or lifter. What cam?