GTV6,
I know this is not the most glamorous of fixes but I have re used the existing bracket. All I have done is bend the existing bracket where the clip mounts at 90 Deg toward the carby, I then drilled a hole and slotted into that with a hacksaw. This has given me a slot to pass the throttle cable down into the hole and the hole has given me the ability to use the two nut arrangement to secure the the outer sheath of the throttle cable nice and solid. Basically it now looks pretty much like a 1600 GT type mount, not the type that comes off the rocker cover but the type that is fitted direct onto the inlet manifold. Similar to the 2lt Escort setup.
Scott