[COPO]

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....the dealer did a 427 swap in the late sixties or early seventies. My bottom line is, what would a car like this be worth for selling purposes?

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If the swap was done as a new car and had paperwork, then the value would be significant. As a used car w/out any documentation, I think its value is that of any other nice non-original Camaro. While an interesting story from a well known dealer, I personally see little value enhancement by the later engine and trans swap. Nonetheless, it is a nice looking car.