Power wagon pinion angles

Hey guys, got questions on 4x4 pinion angles, doing a slant 6 turbo set up on my truck with divorced transfer case. I got the pinion angle from the output yoke of the transfer case to the rear diff yoke dead on, give or take 2 degree difference. Now, does the transmission yoke to the input yoke of the transfer case have to be the same as well? I'm trying to cancel out future vibrations as much as possible. How much angle can my center drive shaft (transmission to transfer case 14" drive line) have? Cause it has 12 degrees, I appreciate any advice I can get.
12 degrees to me, seems like a lot between a divorced t-case and a transmission, albeit a short distance. When we were messing with 4x4s and mud trucks, we always tried to keep the divorced t-case driveline under 3 degrees and used a high angle CV joint on custom shafts for the front and rear.