Big Block SUT

[Bhplumber]

Hey everyone, Im looking for any info you have on swapping a 8.1 and Allison into my SUT. I have read the thread about juicing up the 6.0 but what I really want is the Allison tranny and more power of course. I figure if I go with the 8.1 I can get plenty of power, the Allison, and a part time t-case hopefully without quite as much expense and hassle of swapping in a duramax. Im not really looking to gain gas mileage although it would be nice. I also want the reliability of a factory built engine over one that is built up that I have to tinker with all the time. This is my daily driver and I live in South Dakota so there really isn't anywhere here to take a custom built 6.0 to for tuning and for sure there is no local dyno. Which is why I keep coming back to the idea of the 8.1 swap.