Just two Evan, but not the actual Dart the DC-3's got (only 1500shp), but a more powerful version. The nacelles I've modified and made copies of will fit on the Sunderland fire-bomber I'm building, the idea there was they got 1900+shp Darts which were eventually upgraded to some 2100+shp ones so a bigger water tank could be carried.
From what I've read the Freighter Mk.32 had 1980shp Herculese so fitting on a pair of Darts of 2500shp would do the trick I think. There are even more powerful versions in excess of 3000shp
The nacelle/engine/exhaust would look a bit like this on the Freighter too.
I thought also maybe the main gear could be retractable, sort of like a Fairey Barracuda's u/c