Not the same application but I was a little upset with fitment of my 1 7/8th TTI headers for my LA ebody. The headers looked great, I ordered the polished ceramic which had a show quality look to it. Only issue was the driver's side flange bolt holes weren't even close to lining up, the forward most primary tube's holes were about 1/4 inch or more off. It was pretty obvious when putting the header gasket up against the header flange. I had to cut the flange before the #1 primary tube and pull the tube forward quite a bit to get the holes and tube to line up with the port. Not the end of the world, but not something I've ever had to do on high end headers. Everything else fit pretty good and the passenger side flange was fine.