Hi,
I also have a 66 with a 73 Dana 44. I solved the same problem you're having by purchasing the replacement sleeves for the draglink, track bar and that crazy long expensive tie rod and taking them all to a machine shop to be chopped and threaded.
Now when I need to replace my tie rods I buy two of the small tie rods for $20 +/- bucks plus I can really dial in the front end. Here's the only photo on my phone at 1:30AM that I could find. I think you might already potentially have an adjustable drag link...
Happy Trails!
PS When you do reinstall them make sure the drag link and track bar are somewhat parallel and the castle nuts don't catch on each other. Also, position the drag link end on the toppish side of the track bar for optimal function. GOOD LUCK! I hope this helps!