No.
Canada did not take any of the surplus Mk.VIIIs. DND reviewed the list of available USA equipment forwarded by Brigadier Stuart, the Canadian representative on the newly formed Permanent Joint Board on Defence (PJBD) in August 1940. and decided that the Mk.VIIIs were of no interest. According to a brief outline of the history of the CAC which Worthington wrote in March 1945, a total of 236 Ford 6Ts were imported into Canada. They came without armament, a special application had to be made through the PJBD in October, 1940, to obtain 50 sets. As some of the Ford 6Ts were being used for gunnery training in April 1941 the 37mm guns must have been received by then.
The Ford 6T saga will be covered in my forthcoming Early Armour in Canadian Service part of Serive Publications Weapons of War series (
www.servicepub.com)