67 340 block

First block
D=1968
W-windsor canada
340 =CID
2365= 201 day of 1968 or July-19-1968 (this is the build date)
0196= 196 engine produced that day

Second block
D=1968
W=windsor Canada
2384= 220 day of 1968 or August-8-1968 (this is the build date)
0410= 410 engine produced that date



So as you can see the actual build dates are 13 months and 14 months after the date the block was cast!