plain old dave
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It was well known at the time that the beach imposed about a 10% reduction in speed, due to the drag of the wet sand and dense sea level air. The same car would go 10% faster on a hard cement or asphalt road farther inland. On the other hand all cars were prepared by expert mechanics and tuned to do their utmost. A car off the showroom floor, not broken in or prepared in any way would be somewhat slower.
Ok, if we grant your assertion that the 300Bs that ran on the sand were race-prepped by Lee Petty or whoever (an assertion that isn't well-supported by the documents IMO; clearly IMPLIED but not well-supported) and would be 10% faster on asphalt, the "somewhat slower" for a showroom stocker would be roughly what the "race prepped" car did on the sand: Mid to high 130s.
So, like I said. The Chrysler 300 Letter Series were the first vehicles available to the American motorist capable of 130+ mph with no modifications; buy 300B, get on I-40, drop hammer, break 130 on a long enough straight enough road. A revolutionary innovation.