7 1/4 to 8 3/4 swap in A-body

Isn't there an angle between the driveshaft and the pinion?? That should figure into the equation somehow, shouldn't it?

Say the pinion is pointing down. When you lengthen it, yes the U-joint moves closer towards the transmission, but it also moves towards the ground which is away from the transmission. Maybe the angle is small enough it doesn't matter?