Guy's you are making way to much of this!
1.Most people cannot do anything for the trans angle.Making a new mount to raise or lower the trans is just stuiped.
2.All you are trying to do is keep the joints from running at the same angle and or the rear going over to a + angle.
3.On a Cal-Trac car the pinion will not move that much.Set the rearend 3 to 5 down and forget it.
Lenny