When painting factory OEM 50 year old colors I tend to shy away from PPG these days. As you said the mix formulas have changed over the years, which is true with most brands.
So the last few years I've used BASF products. They still have some of the closest formulas to the old stuff. I primarily use the B/C systems here and they come out spot on, other than a deeper and richer appearance because of the clear, but the color is perfect. I just did a 455HO Formula in Lucerne Blue which is a touchy color to get right (similar to Chevrolet Lemans Blue) and it came out perfectly using the Glamour line of BASF base/clear. I'd post pics but unable to do so. Could share more via email if you wish.
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