SS Dana Axle?

autoxcuda said

In 1970 they were using larger tires. That’s why you see “original” cars with the clipped front lower lip. That was not “as delivered”. It’s a later modification.

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This is typically how Hurst did it on the Cuda. I have tons of pics from ´68-´69. All having this mod. Some a little more, some a little less.
For ´70 NHRA rule book. "Internal wheel-well modifications are allowed, however external fender alternations are not premitted"