Look at it this way in the early '60's you could mess with the timing, change needles, richer or leaner choke settings, all that stuff, then in the '70's catalytic converters showed up and "tamper proof" carbs. the later Duraspark "non adjustable" timing, and down the line you go..
Do you...
Yes, if Ford does the Lit or level, its covered...personally, I like the front pitched down a bit, because when accelerating or driving down the road the rear dips down a bit, and now it looks like a loaded diaper...
Doesn't plugging in Forscan (dealer or non dealer) leave a 'flag' and when there is a warranty claim Ford can deny it because there is a non-erasable "flag" in the memory? Go to a dealer and have them do it, Because the "flag" gets documented into the Ford system.
But Once ya put in a lift...