Shortening & Modifying a Tilt Column Question/Concern

[SCOTI]

So I've cut down a 67-72 era tilt/auto column-shift column to use in my 64 project. I progressively trimmed the outer housing/tube as well as the column shift-tube & the actual steering shaft to the length needed for my modified set-up.

With all of that done/started, the mocked-up column is a finger-tips width away from the dash for increased interior room as well as closer to the firewall for better u-joint angles to the R&P steering unit (Porterbuilt Dropmember set-up).

I'm happy w/how everything is looking. The u-joints + steering shafts are temporarily in place to verify the joint angles & shaft clearance within the engine compartment. I'm ready to pull it all back out & finish welding the housing & shifter tube as well as machine the end of the steering column shaft for a DD joint. This is where I have the question....

There does not appear to be a 'center' reference mark on the steering-wheel end of this shaft (where the splines are for the steering wheel) like on later model columns. Since the steering wheel end of the shaft is splined, the R&P output shaft is splined, & one of the two joints used is splined, does it make a difference where I need to machine the flats for the double-d side of the 2nd joint where it will seat on the column shaft? In my head the splined ends allow for a fair amount of adjustment but I'm not certain it would be enough that 'where' the flats for the shaft are machined are irrelevant.

I thought I would post up & see if other hot-rodders might chime in w/their thoughts & experiences.