I'll tell you right up front that I know nothing about paint. Tim, Denny, and Brad have been trying to educate me ... with little success. Perhaps another 'Bolter can give you info on your GS-664k paint code.

This is a site that the GM Heritage Center sent to me when I was researching the color for the bowtie on my 1954 3104 chrome hubcaps. These are probably near approximations of the original 1954 colors created with modern paint bases and tints. I gave the 54 PPG paint code to a local PPG paint store and they mixed a can of Mariner Blue for me.
> Modern Approx - 1954 Chevy Truck Colors

Tim has a lot of paint color info on his website:
> Right column

FYI - here are interior and exterior details from Tim's site:
> 1954 Chevrolet Truck Colors
> 1953 (and 1954) Chevrolet Truck Color Chips p1
> 1953 (and 1954) Chevrolet Truck Color Chips p2

- Lonnie

- Lonnie
My '54 3104
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post.
lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt.

OLD STUFF ... houses, furniture, cars, wine ... I love it all