If I had a 70 with proof of dealer installation it would be a no brainer, it should be there. But as much as I think the Formulas look more balanced from the side with the rear spoiler I could never drill a hole to install one. But, if I bought a car with one I certainly would enjoy it until resto time.
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1969 Trans Am 4 speed 1 owner barn find-SOLD
http://www.carbuffs.com