I've always been under the assumption that Challengers were built at Hamtramck Michigan (B) and LA (E) plants. But I recently got my first car back with a 383 engine supposedly out of a 1970 Challenger. The numbers on the engine pad are 0G203345. This would be a 1970 engine from a car built at the St. Louis plant. Does anyone know production numbers of Challengers from the plants that built them? The VIN on my car is JS23N0B440736. I'm told this is one of the last 3 Challengers built for the 1970 year and was built on July 30, 1970. And I bought this car off the new car lot at Sharpstown Dodge in Houston, Texas on November 24, 1970