Can't help with the yellow, but I'm jealous.
For some reason I'm attracted to vintage larger scale car kits. It must be due to the two Pocher kits I tried to build as a youngster. First I'd heard of Entex or a Mercer Raceabout.
Whatever yellow you choose, I'd urge you to use a good lacquer of some sort. I pretty much ruined the finish of my first car model in 50 years with acrylic paint and stupid Future.
Have fun with that kit, and a pic of the box would draw more interest, show folks what you are talking about. I only researched because of my specific interest.