A number of interesting comments that prompt a number of interesting comments back:
1. The basis for judging is how the car would have been built at the factory and (when applicable) equipped with Kaiser-Frazer branded accessories if delivered to its original owner at the factory. As a result, while the car may look exactly like the 6 cylinder version, there are gross errors when it comes to judging IF you judge it based on the build tags (body tag, door post serial number tag, etc).
2. There are numerous cases where dealers and/or distributors put non k-F items (especially things like heaters in the beginning months of the 1947 model year) in cars to make a sale on the spot. Unfortunately, it is still wrong, or should be wrong when it comes to judging.
3. One of the reasons the Factory Special/Modified class was created was to let people who wanted to be creative with their cars get some recognition for good work. In this category, cars that are "dressed up" such as the HJ and 53 Deluxe mentioned here (assuming the Deluxe does not have K530 door post or large body tags, as some Deluxe bodies were pulled from the bank and re-trimmed for final assembly as Dragons). In the modified class, anything goes...the criteria should be based on what was changed, how the change(s) were implemented, the quality of workmanship and overall appearance (chrome, paint, etc) rather than did it get built that way. So, we already have such a class for "drivers" that may have different upholstery, drivetrains, etc.
4. Personally, I feel that if the make/type of an item is correct, the serial number (which might indicate the item was made before or after the car model year dates) should not be a big deal. After all, it is very likely that in the case of earlier numbers, the part sat around and finally got used.
5. Unfortunately, there are a growing number of eBay listings for vehicles where the vehicle is mis-represented. Typically, the listing seller states that "I listed it for a friend" or "the actual owner told me it was" in an effort to get off the legal hook, but that does not work in the courts. This is why eBay began their satisfaction program...to protect buyers from sellers who mis-represent out of innocence, or deliberately execute a fraud in order to make a quick sale to an unsuspecting party. I enjoy reading the lawsuit reports that arise after auctions and private sales when the buyers find out they did not get what they were told they were getting.