In the few conversations I have had with Bruce W. he stated that there are different stamped part numbers depending on when the headers were made (I believe it had to do with which shop they were built in). For example, the SS headers that I bought off of you Tony, had a stamp that indicated they were made in early 70s. I think the database of info is kept in Bruce's cranium after years of working with them. Good luck and let us know what you unearth.
....and NO it is not insane to build a car around a set of headers! I get it!!!!!!!!!!!!!
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Sam... 
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