We're taking stabs in the dark here, OK?
The cowl tag was born a 2L car. Those rivets have been replaced. There is no documentation for the car, only the story that it was purchased from a particular dealer in Ohio and purchased again from the original owner. You'd think that the OE would have some documents to that effect, but either they don't and we're supposed to believe it was ordered and made this way or they do, and it's not any L79. A close look in person would reveal any evidence of resonators being hung on the car, correct fuel line and routing, factory floor hump installation and a host of other clues. Again, if it were as original as claimed, we'd get the block stamp numbers, trans/diff stamps and the rest. That's not to say it isn't a cool car just the way it sits and very rare for the two-tone paint, but there are a ton of questions.
My guess? It was a 283 4-speed SS. If it were truly a raced car, can you imagine a buyer who wanted to take the car to the strip right away ordering that color combo on top of everything else? As there is no mention of drivetrain date codes, numbers or stamps, I'm guessing this car is trying to pass for one L79. That in and of itself isn't bad, but calling it an original L79 without much to go on and suspect cowl tag riveting raises red flags. As for the quarters being replaced, Ohio cars, even low mile ones, rust, and I suspect this car had the aftermarket lower brown rally stripe added due to salted roads. An in-person visit would be absolutely necessary, and perhaps an attempt to get its true origins from the Corvette people running VIN numbers from '66 on. That's my guess and I stick to it.