I saw a older hydroplane it was a smaller sized boat. it was powered by a 283 chevy and it had tri power on it. it had the stromberg 97 carbs and edelbrock intake and bug catcher scoops. it looked awsome. i saw how they had the linkage. it was hooked up all togeather no progressive. all carbs all at once. i guess on a boat that is at high revs a lot you wouldn't need progressive linkage. Cowboy