Follow up, I have my pre-1973 k frame (biscuit style, not spool) set up on equal 4x4s and I'm noticing 1 leg sitting about 1/4inch away from the rest
I am personally not worried about it and my plan is to fully gusset and seam weld this k frame. I am certain that these cars have enough adjustment everywhere to be able to take care of that in the car to make it a safe street cruiser. I don't plan on ever hitting 200mph in it
I hope this helps!