Difference between pre-1966 and post 1970 steering columns

Length for one.
Second is the fact the 66’ and older has no crash collapse feature. It is a solid shaft.
I bet it can be done but not just drop and play.
As for a flamming river- I believe that is based on a gm column. I’ve only seen those in the comic books so I’ve never worked with one before. Fabrication is in your future with both.
Finding a 66’ is tough but they are still out there. Post a want add and see what comes in.
Good luck!