I look for 2 to 5 degrees nose down differences on the pinion shaft and the driveshaft, done that since attending one of the old Mopar drag racing seminars back in 1978 or so. More angle is needed on stick shift drag cars than automatic drag cars according to them
As far as the front U joint and differences between the tranny output shaft and the driveshaft angles if you have 1.0 degrees differences or more on any plane your good , that angle will make the needle bearings rotate in the front U joint and not gall up from no rotation