True this. I forgot to mention that a roll cage with forward bars should take up the slack in a door car with a K member modified.

I've left mine intact during my intensive weight loss program with the exception of the motor mounts being removed (Motor Plate) and adding a support gusset to the steering box mount. The Radiator support though very slim adds some rigidity to the front frame as well, but not much.
Keep an eye on that K.