Hi!
Yes! My DC-3 is 83" in span.
If you have a DC-3 with a span of only 93" ..that's around 2.36m (236cm), two 6,5cc (.40) four strokes would be perfect for it.
If you choose twostrokes I would recommend OS .40 LA. Not a ball bearinged engine.
I can't understand why they recommend 10cc (.60) engines as this is way way to much power and will only make the DC-3 heavy and difficult to fly. Perhaps it was the only reliable engine size in the sixties...or that people didn't know better....

The C of G om my DC-3 is around 25% total wing area, as on most other airplanes. I haven't checked out the percentage on the side wiew though