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I know what you mean about those old machines. My 70 Charger had the extra $50 undercoat job done by the dealer before delivery. The entire bottom of my car, from one end to the other, is covered in a 1/4 inch thick layer of that petrified Labrea Tar Pits goo.
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My unrestored/original '69Z was sold new in Toronto, and got the same dealer undercoating - it's all still there; I only worked the prop valve in the photo to verify the date.