Sorry for getting off-topic but I am assuming that whatever guidelines you choose, you are still bound by the information on buidsheets/Marti-Reports that would dis-allow any dealership and pre-delivery changes to the car (e.g. radio upgrades). I am expecting that Ford followed a pre-delivery process and you would expect that to be reflected on judged cars..... Please note, the question is for interest sake (enlightenment) and is not intended to raise debate or push an agenda - I'm just curious.
Again depends on class and organization. Example MCA Concours, in that class no buildsheet or Marti report was required nor as requirement for showing. Changes from original are accepted as long as things like the door tag match what is being presented. Lots of discussions about those things took place over the decades