Separate names with a comma.
What makes the most sense is a number missing from the casting.
Your June casting carries -1 . The other block carries a -2 indicating...
What year difference?
A casting date of 10 Oct or 11 Nov 1965 would be totally appropriate for an engine assembled 12 20...
Wait for the picture of the pad.
Those numbers are not engine assembly codes.
If that were true, 50% of the population would buy products designed for the other 50%. Doesn’t happen.
Good cars don’t need a shill or puffery. Good cars stand on their own merit.