K Frame Question w/ picture

So my k frame has this reinforcement bolted into. There doesn’t appear to be any rust or breaks from what I can see.

The car was originally a 273 commando car, had a 340 put in it, now has a 318 as previous owner didn’t like the lumpy cam in the 340.

With 67 having the 1 year only K frame and no 340 option(?), I’m wondering if this is just indeed reinforcement for the weight of the 340? Or if I should be concerned about the k frame. Like I said, it seems solid everywhere I can see/touch.DE042593-7E4D-42FE-A159-CC651A28CA1D.jpeg