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John, I grabbed the motor yesterday. My concern with using it is getting the wiring to work with the coach side. I have a silver MUI motor in the coach now w Allison five speed. I also do not believe the DDEC motor has the aftercooler on it. One concerning bit is the oil system is on the opposite side of the motor from mine(new motor its curb side). hopefully this is not problematic w motor mounts. The new motor is also  missing the data plates. never know the old motor may get an out of frame if the marrying of the 2 doesn't work....
I have some mechanical ability but the electrical side is all new to me so its all going to be a work in progress.....
plan is if the mechanic commits to the job

pull motor and tranny w service truck where she is

Marry the rack, governor injectors (rebuilt) and blower/aftercooler (rebuilt both) 
Rebuild starter and alternator, new gauges(Suggestions?), pyrometer, alarmostat at 200 degrees, Re-core radiator w extra capacity, Water sprayer for radiator?

taller rear gear if possible , rebuild drive shaft / ck tranny and service while out

Clean up engine bay, re insulate (Dynamat?) clean up wiring and air plumbing

Anyone w a classic added a second radiator?given tranny cooler its own?