Pinion angle question.

How critical is the u joint working angle? If I leave the tail of the transmission pointing down 2.4* like it is currently and roll the pinion so the yoke is at 0*-.4* up (allowing 2-2.4* rotation) that would give me a u joint working angle of 7.3*. I could raise the trans to point .9* down and have the nose of the pinion pointing .9* up on acceleration and that’d give me a u joint working angle of 2.1*