One good thing about your column that I just noticed is that you have the Later design column.
The 67 and early 68 shaft was straight with no universal like you have on the column in your truck.
I put an arrow at the universal in picture below.
It has it's own u-joint inside.
So this makes your shortening easier.
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The early bird gets the worm,
But the second mouse gets the cheese
84 Chevy K-20
63 Impala (my high school car)
http://67-72chevytrucks.com/vboard/s...Crew Cab Build