Park not engaging after front end work?

I have a '72 Duster 360/905/8.75" 3.55 sure grip. I just finished doing a power steering upgrade from the factory box to a Borgeson box. I also swapped the factory front drums to disc with the Dr. Diff kit. I'm currently waiting (forever it seems like) to get it aligned before I can actually drive it, but I noticed when I took it for a short test drive that PARK is now essentially the same as NEUTRAL (wheels turn freely). I am assuming it is related to my having to disconnect the column to do the steering swap. Nothing out of the ordinary when disconnecting/reconnecting the linkage. Shifts in and out of PARK no problem. No binding or anything. Just no PARK.

Any ideas about what to look for? I'm a competent mechanic when it comes to the engine bay, but steering/suspension/brake work, at this level anyway, is relatively new to me. Thanks.