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.