Wow, big money.
I have to say, anecdotally, I have owned about a dozen sets of original Chevy Kustom Headers from the 1960s-70s and none have had that style port flange, or a square collector flange. Obviously the part numbers are right but I'm wondering if anyone else has any input on the originality of this set.
Matt Kurek - these don't look like the Kustom headers you found a couple years back, either.
Anyway, always willing to learn...look forward to the feedback
Link to 1968 Camaro Z/28 Kustom Headers