I agree that board is too large for you. I think you will find that you will have to work too hard to get it on edge and do any kind of quick maneuver. I would say that you might have some luck with it in deep (very deep) powder, but nowhere else.
I think I rode the last year that they made the Fatbob and it is about 8 or 9 years old. It is to date my favorite board I have ever owned, however, I am 6'02" and 200 lbs with a size 13 foot. It too was a 163.