67 Fastback getting 8.8 rear

Whats interesting is the stock 7.25" spring perches are set at positive 7 degrees. Measured by leveling the perch and putting the angle finder on the pinion flange. I mounted my perches on the 8.8 at 5 degrees negative so im way off ill have to cut them off. My trans angle is 2 degrees negative so ill weld the new perches probably 2 degrees positive to parallel the drive-line angles.

7degree2.jpg