Here's how I finally fitted mechanical linkage and fuel lines.
Because of the kickdown switch, there is no room for the slotted rod and lever on the rear carb, so I reversed the carbs and ran the slotted rod to the front carb. A lot of tweaking was needed with the throttle cable tower to get full throttle opening, but we finally got it exactly right!
The Ram Air pan would not clear the special fuel fitting for the front carb fuel block, so I ran the '64/'65 style 3/8" fuel line with the distribution block turned upside down compared to the '66 Tripowers. It makes access to the fuel filter more difficult, but that won't be changed more than every few years anyhow.
Had one hiccup with the rear carb needle sticking, but a sharp tap with a screwdriver handle fixed that. Idles really well at about 700 rpm with 15" vacuum. Power brakes should work fine.