Manual column shaft issue

I installed my newly restored column and it came up 3- 3/4 short to center of manual coupling. So obviously mine is a power steering column, Does anyone know the shaft length difference between the two. I'm trying to figure out if my column has collapsed a bit.
I am considering lengthening my shaft because I don't want to use an aftermarket coupler.
This is my first Mopar build so I'm learning every step of the way. Car is a 68 Valiant and column from a 68 Dart FYI.
Any help please