The ECK letters lead me to believe it is a 1955 or 1956 produced engine block.  I'm guessing that the C in front of the ECK is an indicator of Canadian production.

John Mummert's web site at Ford y-block.com is a wealth of technical information on this engine series.  Below is a link to the web page on engine block casting numbers.  Click the link for access.
http://www.ford-y-block.com/Block%20identification.htm

Other Forum members, some from Canada, may have additional information to help you with your inquiry.

Hope this helps. 

ADDENDUM:  I JUST noticed that the second number in JM's listing is the CECK number you asked about!  


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

I have this y block with the id of
CECK 6015A
I know it is a Canadian built export engine but can someone give me any more details on it please.....