One of the regulars over on yenko.net was asking about these headers. Here's the link. Don't know if non members will be able to read the link. http://www.yenko.net/ubbthreads/ubb...981/Re_MT_Prototype_Headers_for_a_#Post496981 Not mine, just doing a favor. If you have any input, you can figure how to get hold of the one asking the questions.
And now they are on Ebay.... http://www.ebay.com/itm/67-Buick-GS...Parts_Accessories&hash=item1c29db6480&vxp=mtr