With that motor try starting with something like a 22-23t pinion. I used to run 20/81 in my BJ4 with a 10 turn Checkpoint, with the bigger spur in the B44 it will be pretty close.
Setup-wise, I've had a good look at a B44 recently and everything has moved round slightly compared to the BJ4. 2 washers and outer hole on the rear topdeck is similar to the BJ4 back end setup I run. Shocks on the outer hole on the rear tower and inner hole on the front tower, everything else is pretty similar
