What was the quickest car (completely stock) in 1969?

[Lynn]

Unless you can travel back in time, and conduct side by side comparisons with the same driver under the same conditions, I don't think there is any way to know.

By far the BIGGEST factor is driver. That explains why there may be a full one second difference from one test to another on virtually identical cars.

The other two huge factors are tires and track conditions (which include altitude relative to sea level, temp, humidity and of course the actual surface of the track).

I remember someone posting about the first completely stock car (an early 409 425 HP car) to break the 4 second barrier 0-60. I responded to the post saying there is no way it could do so on those bias ply 6 inch wide (tread) tires. The answer? They put some slicks on it for the test. Hardly a "completely stock" car at that point.