I don't find issue with the linkage on the Pantera. I did run that set up on my 68 Shelby when I had the Boss351 in it and I did have linkage issues there.
The simplest solution on it was to the linkage was to use Inglese's adapter kit to have the carbs parallel rather then opposed. The throttle input also had to be put on the drivers side of the manifold and the pedestal was useless.
theoretically the Hall manifold is correct with carb orientation because of line of sight to the valve. Does it really matter? Probably not much.
For the Pantera, the pedestal works perfectly for me.
I had binding initially with it on the Pantera but moved the left to right bank connection to the rear. That made a very simple linkage connection at all points.
So what's wrong with purple?
I use a Holley electric fuel pump and find -6 hose are fine. 3 psi max. You do not need high pressure with these things. That is Holley think.
I don't use those fuel rails. Those are the ones made by ISP in Colorado. I use 3/8 ss tubing with tubing nuts and the Earls Weber T fittings. I like the sorta retro/techo look and they make great handles for hauling the manifold around.
How much off center are the fuel holes on the rails? 30 thousands? Gotta leave the carbs loose, align the rails, then tighten the carbs I would think...not like you wouldn't already know that?
Check out Jay Cee web page for the Weber parts you need.
http://www.jayceevw.com
The bearings are sealed. There should be no way the throttles should bind. White lithium grease here and there is all that you need.
The real question to me at the moment with Webers is the camshaft.
You need to remember that these things were run with race duration cams and overlap that blew the fuel out like a geiser.
I can tell you that my heads need lift to work. The "Weber" cam with 586 lift and hydraulic lifters isn't going to cut it for my heads. Try 6 something.
That is the part that is unresolved for me.
I still feel that using the Weber cams gives away 100hp needlessly. This is the part of the race vs. street that I may never be able to resolve?