One wire lock-up, 4 spd automatic w overdrive into A-body.

If I remember correctly (don't quote me), with the angle finder on the back face of the tranny housing (vertical), it was 1 1/2 degrees down. But that's if I remember correctly?? The easy way is to put a level on the surface that your air filter housing sits on. The top of the carb should be level for the carb to function optimally. If I remember correctly the bottom of the tranny pan should be horizontal as well. But in the case of my 2004R installation I wasn't able to get the tranny quite as high as the 904. It was very close to the factory height (angle) but I would have had to cut more to get it higher and besides, if you remember my 2004R posts, I had a rod end and mount above the tranny to support the shifter torque shaft. Maybe somebody else can chime in. If the car frame is level I believe the tranny pan (or pan rail) should also be level but one degree down doesn't seem to bother my car.
If your tranny angle changes from what it was before you'll have to adjust your differential angle!!!
treblig