I found this picture from an old thread showing the witness mark on the FW.
Here's the witness mark on the flywheel. It must be aligned with a similar mark on the crankshaft.
Attached Thumbnails
Flywheel installed on crank. The witness marks are tough to find...liberal application of Brakleen and vigorous wiping with rags revealed them. On this crank, there's one on the flange and a corresponding one in the relief for the pilot bearing.
Attached Thumbnails
Charlie