I'm there with you Mike, you've done things I've had in mind for years to do.
I like the AGR steering rack, but it's way stiffer compared to OEM Fox racks. I don't recall the one 03 Cobra I drove being anywhere near that stiff. So the Cardone rack I have for my other Mark VII I expect to be similar to other SN95 units.
I plan to do the k-member eventually, but I'm not sure if I have to when I remove the air springs, or can do later.
I gather the Cobra rotors are not easily upgraded(thicker or two piece). So those may be the only good choice if I can't see a good option to fabricate a caliper bracket(have to have a feasible rotor choice to work with it).
92 Mark VII LSC SE - soon OBDII and 4R70, GTC kit and 347, custom paint.
98 Explorer Limited project to add 4WD, XP8 parts, KB blower, paint, 337.
99 Limited mail vehicle, SOHC 4WD, later 306/4R70W swap. 1998 Mountaineer spare. 72 Ranchero 351 Clevor project.