Throttle Linkage Installation continued...
I also removed the studs that held the original throttle linkage base plate in place.
Throttle Linkage Cross Bar Installation
For this step, you can either loosen one of the anodized brackets from the manifold body, or you can remove one of the attached ball ends that the cross bar fits over - I loosened the 2 bolts that hold the bracket to the manifold and fit the cross bar over the ball ends of the brackets:
Once the cross bar is installed, you start to get a better feel for how the throttle linkage works.
Throttle Linkage Shaft Installation
Next I installed the adjustable throttle linkage shaft that connects bell crank (attached to the manifold) to the cross bar (shown attached in the previous picture).
Its helpful if you loosen up the throttle linkage shaft adjusters before you install them - they will need adjusted and it's difficult to break them free if they are installed.
Finally, I installed the small adjustable throttle linkage shafts to each end of the carburetors:
Once the throttle linkage was installed, I adjusted the throttle linkage shafts to provide a full range of throttle opening/closing, and confirmed that the left and right throttle linkage was adjusted to allow both to freely rest against the idle stop and provided equal throttle movement left/right.
A top view of how the installed manifolds, carburetors and linkage should look when installed (correctly I guess - this is after all, my first installation...

)
I spent a bunch of time looking at pictures and researching how these things are supposed to be installed - and still got it wrong on my first "test fit".
Long winded, but I hope this helps folks looking for this kind of info in the future.
Gordo