Pinion angle....with pics

You want the car at ride height with the suspension loaded when checking the final angle. There is some math you can do. I measured my original pinion angle with the spring perches and the yoke and then just welded my new perches to the same angle. If you set your pinion angle with no weight on the suspension when you lower the car back down it's gonna change. I can't remember the numbers now. I think was something like 6 degrees no weight and 2 degrees with weight. So it moved 4 degrees. (In theory) like I said I can't remember the numbers. I'm sure it's in a thread here somewhere