Brian posted pics over at V8:
http://v8buick.com/showthread.php?t=91251They are very close to the upper z-bar. Brian, who made these headers?
Header manufacturers included Kustom, Hooker, GSCA, and TA Performance.
I have a set of Kustoms on my blue car, and a set of GSCA repos in the box for future use (not for sale!)
My Kustoms have poor ground clearance. TA's are reported to be poor as well.
I'm unsure if they are the same design (believe they are), maybe I'll start a header pic thread.
Early GSCA headers had a larger diameter collector than the later ones.