I would suggest the manifolds...
I worked with a '67 GS400 and tried the TA headers which were supposed to require minor mods. They turned out to be, change the steering assembly. I decided to disassemble the headers and reassemble them so that they sat tighter to the engine. Then a couple of dimples for better clearance and that side was good! Then I found the passenger side required notching the frame. They are sitting on a shelf. Apparently if I had been working with a non GS400 and had used the T/A frame pads, the passenger side would not have been a problem.
Hope someone has a nicer story
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