They have always been $300.00 cars even if they were a Road Runner. I wonder if he would consider the Plymouth Volare that had the Road Runner stickers on it a Road Runner too.
The first time I saw anybody pay any attention to those cars was on the Counting Cars show.
As to your last point. I learned my lesson with people. Even if I know they are wrong, I just let them have their fantasy.
I was once talking to a mechanic, an old mechanic, and he told me he once saw a 1958 Camaro.
I thought to myself that maybe 2 years before introduction there could have been a prototype, but not 9 years.
It turns out he was talking about the El Camino which officially came out in 1959, so there probably was a 1958 prototype at one point.
I didn't argue with him as it would have done no good at all.