I got lucky on the fuel; the guy who sold my carbs to be had a custom hard line made up that links all three carbs. It is just beautiful.
As to linkage, Stevehose and I had a thread on this a couple years ago (which I can no longer locate, but I did find this: https://www.e9coupe.com/forum/threads/show-your-engine.23431/). I copied his intercouple setup. The one concern I had was that my car was missing the portion of the bell crank assembly that acts as a stop when you depress the pedal to the floor. I eventually found this (Thanks to MaxFish giving away a stash of left over parts), but felt this was critical so as to avoid placing too much stress on the throttle shafts (no matter which type of linkage you employ). As noted in the thread I reference, some feel that the bar and rod actuators look better.
As to linkage, Stevehose and I had a thread on this a couple years ago (which I can no longer locate, but I did find this: https://www.e9coupe.com/forum/threads/show-your-engine.23431/). I copied his intercouple setup. The one concern I had was that my car was missing the portion of the bell crank assembly that acts as a stop when you depress the pedal to the floor. I eventually found this (Thanks to MaxFish giving away a stash of left over parts), but felt this was critical so as to avoid placing too much stress on the throttle shafts (no matter which type of linkage you employ). As noted in the thread I reference, some feel that the bar and rod actuators look better.