55.2-59 Pinon angle on 56 4x4 build

[1957Napcofan]

I'm restoring a 56 Chevy 3100 and setting up the drive train angles.
Started with the engine/trans/transfer case at 3 degs. With that I had
16 degs angle on my rear driveshaft so dropped the drive train to 5 degs.
Have the transfer case yoke at 4 degs and the pinon angle the same.
This puts my driveshaft at just about 10 degs. Thinking this will cause
a vibration? Can rotate my rear axle because I have new leaf spring pads
and haven't welded them yet till I get this sorted. Should go
with a Double Cardan u-joint at the transfer case and point the pinon
at the transfer case to have zero angle at the pinon?

Stock frame 56 with a SBC 350, 700R4 trans and NP208 case. Has just single
u-joints on both ends of the rear drive shaft. Front shaft has a Double Cardan
joint at the case so front won't be a problem. Want to get this figured out before I send the frame and axle housings to the powder coaters. Need advice
from someone that knows more about this then I do.