Stuck in the Middle

If the 8.8 bolts right up (and has the gearing you are looking for) and it's away to the races, then it's up to you if you are ok with it. I have no first hand experience with this swap. With every swap/mod, there are things to consider. With this one, besides physical measurements/fitment, I would be thinking driveshaft, brake lines/hoses, proportioning valve, e-brake, etc. It's just a matter of pros & cons and overall being ok with the 8.8 being in your Duster.