I'd guess around 20% on a real desirable model, such as a BB/4spd SS convertible like that one. The more rare it is, the more those numbers are worth...
On a common Malibu, they're not worth a dime...
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Derek Kiefer, member of Minnesota's Northstar Chevelle Club
69 Malibu Pro-Touring - 69 SS396 3spd - 23 Model T roadster pickup
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