Fordged 318-3 truck crank or Poly crank, need help ID

The other thing that might be an issue is the thickness of the 8 bolt flange. The picture looks quite thick.
Years ago a buddy was looking for a 426 hemi crank (which is stock with an 8 bolt) and found a 413 forged truck crank with the 8 bolt flange. But the flange was much thicker on the 413 and would have been an alignment issue with the flywheel. Not sure if it applies to smallblocks, but just throwing ideas out.