Kind of a tough call. Gotta look at known survivors and vintage photos. Also, the assembly being phosphated with no surface prep sure doesn't promote paint adhesion.
Was looking at the thread over at the Yenko site
https://www.yenko.net/forum/showthread.php?t=171247, at the vintage photos. It would appear to have been blacked out as far as I can tell. Like you say, could be something somebody "improved" upon getting cars ready for the race.
Guess we should start a new thread to get to the bottom of this!
