Re: 1969 Chevelle SS 396 L78 car, Frame OFF 4 speed!
Usually parts would be pierced. One example of drilling, was when we built the Dually trucks a few years ago. The side of the box was cut out with a plasma cutter then the box went into a station where the sides were drilled for the attaching clips. If I get the time, I can dig out a pair of original used SS396 fenders that I have and give the holes a close look. Piercing and drilling don't look the same.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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