[RICK LAKE]

Olddog Sears sell a digital meter for angles that works great.
I am going under the thought that the frame is straight. Is the motor off set in the frame?? Era and some others are from even to 1" off to the right.
The right/left on the output of the trans needs to be parallel. This cancels out the drive shaft having a vibration at certain rpm range.
Has far as the trans and read end you want a -1 degree on the rearend yoke and about a +1 on the trans output. If you can get it this close.
I always runs the rearend in the negative readings because of rotation when the car is accelleration. It want to twist up.
Start with the motor and see what the angle is on the top of the carb if it's flat, then work back from there. You may get a 2-4 degree angle There are shims and shorter trans mounts that you may need to use to get this where you cancel out the angles. As low as you are within 2-3 degrees, normal driving will be OK. IF you are going racing, this a different story Rick L.