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The thing that killed my Allisons was heat. Luckily on the A2 trucks they can cool the transmission better with the larger radiator for a smaller displacement motor as well as a Air charged cooler to supplement the heat exchanger. On a NHC250 towing in the summer months the fan clutch will...
I had a setup like this and I removed the blackout light and adding ducting to go to the air box.
https://www.steelsoldiers.com/showthread.php?139835-M939-air-filter-mod/page5
The allisons are junk and do not like high torque or high temps.
Dual fuel line it. #16 button, adjust your rail pressure to around 175. Setup a ram air intake system and leave it be.
It will do fine. You can get up around 300 or so out of just the motor. If you want to add a turbo go for...