[bobcowan]

A cross bar linkage like that can work just as well as a center bell crank. Or just as poorly.

The trick is how they are mounted to the throttle shaft. Both ends of the bar MUST move through the exact same arc. Otherwise, one bank will open at a different rate than the other bank, it it will run bad right off idle, and get worse as the throttles open wider. With your synchrometer, make sure the air flow is exactly the same in all 8 bores at idle and higher rpm's as well. I balance mine at idle and 2,500rpm's.

As long as the throttle levers are exactly the same at both ends of the arm, it will work just fine.