Just my $.02 on colors on first-gens...
IMO, These cars have some really defined body lines and creases (esp in 69) and so, bright metallics with fine metallic particles really work especially well on them.
One thing I like to do is, when considering a color that was not an available original color on that particular vehicle, I ask myself "if the designers of this car were sitting around a table in 196X looking at color samples...would the color that I'm considering today have had a shot at making it, as one of the factory available colors? ...just one more way to look at it...
I have tended to be somewhat "conservative" with color choices. I have heard quite a few people with cars painted with various wild colors say that after a short while they "got sick of" the color...
That being said...I'm sick of "conservative" colors now, and this time I'm going more "wild"
-Rob