I flew DC-3T in the Congo for several years for the International Red Cross. It was built in 1943 it flew in Normandy Invasion It was converted by the South African Air Force for coastal patrol. SAAF bought about 30 and converted them. Everything was updated. Cockpit was stretched 48 inches giving pilots shelf space and jump seat. Double cargo doors installed and had a gross of 29000 lbs with 1130 gallons of fuel in four tanks. Had a range of 1200 NM at 10,000 ft or higher. Engines were derated P&W 6-65R, Baslers are -67Rs. They would pull 4500 lbs. of torque if needed for a total of 1400 hp. each but were derated to 3000 lbs of torque pulling around 900 hp.on takeoff. The 1400 hp was there if needed.
There are still several abandoned stock 3’s parked around the Congo, a few years ago. Company in Pretoria will convert one for around $5 million last I heard. They are 10 knots faster than the Basler because of the narrower
cowling and longer wingtips. There may be other changes that I am not aware of at this time.
My Dad flew DC-3s and DC-4s for United after the war (he was a bomber pilot in ETO during the war: B17s and B24s).