[markjohnson]

Bob, I had a set very similar to those back in the eighties for a Chevelle. I don't remember the brand, but someone should recognize that strange 4-bolt collector flange for a specific manufacturer. On a side note, I could never stand those four individual flanges where the header bolts to the head. In fact, I'm getting upset just looking at them! The one-piece flange was always much nicer to work with.