Flywheel is the 168-tooth variant casting number 3705410. The other number cast into the flywheel is 31855 or B1855.
So, do I get to choose between a 9 1/2", 10" or 11" clutch kit?
Again, flywheel is off a 1955 Bel Air, using the 1958 truck bellhousing (for the proper motor mounting) and I assume use the truck throw--out bearing to match the clutch fork.