The '6' would seem to indicate a 1945 Model, with the 'D' indicating Mercury rather than Ford V-8, and the 'F' right hand drive. # 89113 I think is the sequential production number.
The last known {to me} 1944 Model, 1945-built Ford CMP engine was 5G-11449F...all CMPs built in 1945, Chev and Ford were '1944 Models'. However I know of 1945 Model Modified Conventional Pattern trucks with 1945 serials. I know there were rhd Mercury cars and trucks, so could this have been from a 1945 truck? Or Windsor-built new service replacement?
There should be I suggest a casting date on the block..never having actually pursued one on Ford blocks before I cannot confirm for definite. Chevrolet used 'A' to 'J' for January to December, then '1' to 31' for the date and then '0' to '9' for the year. I believe other manufacturers used a similar system, even though Canada often used Day-Month-Year notation rather than Montn-Day-Year as per the US.
Perhaps someone knows otherwise? You might also try Sandra Notarianni, the Ford of Canada Historical Consultant
snotaria@ford.com
(905) 845-2511 Ext. 1562 FAX: (905) 844-1198