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While not doubting your superior knowledge
there is no difference in the engine mount for the number 2 engine with either B2 ( the original -200) engine and the B4 ( -500 engine)
The difference is the S duct adapter which is different lentgh for the B4.
The S duct in the aircraft is identical, the difference is the length of the S duct adapter that joins the S duct to the front flange of the engine.
The adapter (about 5 inches long) from a -500 ( and there are a few being broken!
) bolts onto the S duct in place of the original adapter and viola ! install a B4.
You also need a few Lockheed SB's for legality
I believe that a company called Flightspares are handling the Miami Freighter together with the Ex ATA aircraft which would be used to replace parts on the freighter damaged by the hurricane.
