BTW, there's a roll pin locating the crank position sensor reluctor ring on the crank, people have been known to reinstall the flywheel in the wrong position, crushing that pin, which makes the flywheel sit crooked on the crank.
Remove the access cover on the right side of the block opposite the crank sensor, and as the engine runs, looks for a wobbly flywheel. Hint: It should run PERFECTLY true.
That's easy enough to check without tearing into everything, though if it's not straight, you'll have to tear into everything
.