The Engine/Tranny Angle and Pinion Angle should be mostly parallel to each other.
The Angle formed by the transmission output shaft centerline and the centerline of the driveshaft is called the front working angle.
The Angle formed by the pinion shaft centerline and the centerline of the driveshaft is called the rear working angle.
These 2 angles should be within 1/2 ° of each other.
The difference between the 2 working angles front and rear should not be more than 4°.