Default Pinion vs output shaft angle. How much is too much

[RalliartRsX]

So in my project, after finally getting VET, turbo, CAS, etc etc to fit, its now off to the gearbox. On initial measurements, the difference between the pinion and outshaft angle is about 1.2 -
1.5 degrees. Its independent suspension in the rear, so the diff is isolated from up/down side/side movement. A 1 piece driveshaft ill be used.

The issue is I cannot physically get the gearbox any higher without some cutting/welding and I am trying to keep the chassis all in one piece.

Is there a rule of thumb in regards to difference in angle between the pinion and output shaft?? I have read anywhere up to 5 degrees is acceptable, but would like to hear some other opinions or "facts".

Note: I have seen the below pop up in regards to proper angles