Pinion angle question

No you never did it right side up. At least not that you pictured. Either way will get it done.
No I didnt picture it but I did it both ways up and down to check my work and got two different readings. I leveled the blocks and set the flats of the arch on it and got like 6 degrees the flipped it around to double check and got like 8 or 9. That's what's pictured. That's why I am so confused how I get two different readings it should be the same up or down