Possibly, or 997cc or 1198cc: they all used the same block and number, and when they were rebuilt following wear, an individual engine could come out as any of these sizes, irrespective of its original size.
The only reliable way to check the size is to measure the stroke. This can be done by removing a spark plug, inserting a long screwdriver and winding the engine until it is at its lowest point. Mark the blade, then wind the engine until it's at its highest point and again mark; the difference between the marks is the stroke. The strokes are:
113E stamped above the engine mount means it's a 1200.
105E and 113E are both 6" blocks
113E head 1200. Confusing is why they marked E and F together. E means high compression. F low/c head. Pete