Older Paint Formulas

[70-SS/RS-L78]

I am looking for a someone who is doing the older basecoat paint formulas that are accurate and match the original factory paint. I have tried PPG and Sikkens and we used both of their cameras to match a 1970 GM Code 53 Gold and 69 Cortez Silver. The formulas they came up with were not even close when I did sprayouts. I understand I am doing full paint on the cars but I still want the correct color in all lights, Not just the sun or shop lighting. Any information will greatly appreciated. Thanks....
Mark

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