Chick, I saw yours and the ones on eBay, wondered the samething. Jon's answer above explained the reason for the differences. I broke down and sold my Smog System, after Jerry was here a few years ago, we had talked about putting the headers back on over the smog, he agreed, with the cowl plenum, headers were the better choice.
Did you send yours out to get coated or do the yourself?
Sorry for the delay in answering Paul as I was away for a couple days the end of last week..... Jerry recommended a guy who turned out was only about an hour away so I went that route. By the way just finished making my own set of repro white header gaskets. Used a picture of an original set to model after.