All 62-72 B and E body V8 K frames fit big or small blocks. Having a skid plate makes it a 440 K frame.
The E body and 71-72 B body do have a different angle to the steering box. This can be seen at a glance if you have a 70 B body K frame and a E body k frame side by side. The E body type has a different looking reinforcement plate.
Yes, the steering box angle changed both vertically and side to side. That is why E bodies and 71-72 B bodies use that “bent”looking Center link.
I installed a complete 72 B body K frame in a 66 B body once with no issues. Perhaps not the ideal angles for the coupler, but installed and operated fine.

Your K frame will be from a 70-71 440 E body, or a 71-72 440 B body.