Rear-end Noise After 4-link

[TheJDMan]

Without seeing what you are measuring those pics do not provide any reference point. You really need to get that car up on a 4 post lift where you can keep the suspension loaded and then measure the various angles. It won't do you any good to jack up the car and try measuring. Have you contacted the "respected builder" that installed the suspension to see if they can provide any assistance? Just FYI, 3deg down angle on the engine/trans is virtually a world wide standard for front engine rear wheel drive cars.