What you have would be F1011A. It was not unusual to see an "I" in the stamping code used as a "1". It breaks down as a Flint produced Passenger engine, built on November 10. Another thing to check to pin the year is the block casting date, which would be found on the passenger side of the engine, near the starter. That date is usually a bit earlier than the assembly date, but should be within the same year.
