On the pinion nut I marked the angle before removing the nut then reinstalled it to the same angle. Never bothered with the torque and that was 45k miles ago.

Are you keeping your stock 2.65 diff? I think you'll be disappointed with the 5spd/2.65 off the line especially with any load in the car or uphill. Also any freeway hill or acceleration under 70mph requires a downshifting to 4th. The wagon body is also 300lbs heavier than the sedan. I'm currently swapping a 3.07 diff into my 300D/5spd because I got tired of constantly slipping the clutch when accelerating from a stop. The 300E 3.07 already came with the smaller flange.

Good luck

__________________
CENSORED due to not family friendly words