Did you ever have a build that was going smooth until you hit that inevitable bump in the road. Yesterday when I put my 464 in my 69 GS400 pro-touring build everything went smooth until the T/A shorty install. Whammo drivers side header has severe issues. The steering shaft interferes with the 2nd tube. Not just a little but a lot. Basically hacked up my new shorties. Had to heat up the tube and dimple the sh@t out of it. Then I cut the and ground the steering shaft as much as I could to clearance the header taking as little metal as I could not to compromise the strength of the shaft. Doing this to minimize the the dimpling of the tube. Still rather skeptical about the flow of the tube. I bought the shorties to pick up ground clearance. Still glad I bought them I might have the tube redone when the car is repainted next year. Buyers of the shorties beware they are not just a bolt in header at least on my 69 GS400. Maybe I did something wrong. This isn't my first build but this bump certainly was a pain in the ass. I will post pictures of the mutilation when I finish this morning. Makes me want to puke.