I agree with the first answer and I did not read much more.
But pinion angle with 500 horse power
with leaf springs
or with 4 bar
or with Ladder bars
or with 4 LINK are all different AT RIDE HEIGHT.
My drag car was Ladder bars and the pinion angle at the rear yoke was 2/3 degrees. @5000.00 RPM launch it was basically 0
https://www.hotrod.com/articles/91758/