I have gone through the same thin with my 68. I have tested almost every available, the closest is the discontinued scott drake l-5732, but I could not find enough to do an entire car. The paint should be metallic, npd s AP-5732 is non metallic, and out of stock.. npd s AP-5792 is the closest, but only a slight metallic and very flat. I am using this and top coating it with clear to get the correct sheen, somewhere between satin and semi gloss.. there are not really any good can options for the 68 dark red since scott drake discontinued their product. I sent them an inquiry on this, but as usual, I got no response.