Diff fits just fine up front, just flip it over.
Not sure if the new kit comes with steel driveshafts up front, but most of us bought them about 1 run after we got the car when we realized the aluminum ones don't work with boards. I've yet to bend a steel one.
With the short arms, you'll want 42's up front if you run a diff, otherwise they can bind on the t-nut.