1967 FB Barracuda Formula S 4 speed

The radiator and trunk number have the shipping order number.
It has the year, 67, the plant, Hamtramck, MI, the scheduled month and day, April 5th, and the sequence number.
The scheduled month and day, and the sequence number would be on the fender tag.

The last 6 digits of the VIN are a sequence number as well, but not related to the SO sequence number.

What's the assembly date stamped into the engine block below the distributor?