Not a mistake. It is the correct date. It's the paperwork from a 1966 D/Dart which had the LO23 vin callout. Not the 1968 LO23. I posted it to show what they did to get the LO23's through the build sequence at the plant.
I saw an old post on this site reguarding the LO vs L0 vin plates. This is from March/1966 which is prior to the launch of the D/Dart. It states that the VIN is intended to be L"OH".
I'd go with the color that had the best racing history. Looks like it won an NHRA Championship when it was painted blue. If I was going to paint it for looks alone, I'd go red.