67 Big Block K-frame Reinforcement

Thank you Jim, I appreciate the pics very much, and the info.
That is tweaked alright, and I have no desire to separate at this point.

I'll keep it simple, I'm no master welder or fabricator but I'm sure I can stick to my short plan I detailed above, and maybe add washers to the exterior.

I will never jack the car up using the k-frame, but this thread makes me wonder if there is any benefit to bracing between the upper and lower sections?

I have no interest in pursuing such a modification, but it does appear the 2 lower holes line up with 2 of the upper holes.
If I was developing a reinforcement kit, I would test welding in tubing between them, top to bottom, and adding one in the middle, and see if a jack would just push the top layer out of wack.
At the least, putting tubing in those holes would prevent the majority of oil and fluids from draining into the k-frame, maybe.

Ok, thank you fabo. This began with adding new upper amd lower control arms, sway bar, etc. Grew into a might as well pull the k and clean/paint, to another might as well ask questions and address some issues.
Now the work begins.