[~The Jester~]

Basically it's like this. Whatever the MOTOR needs, hook it to the carb. Extra ports? Block them off. Carb manufactueres have to build ONE carb to fit MANY applications, so there's vacuum ports all over them.

For example, On my car, big one off the back of the carb goes to the brake booster. Andddd, that's about it. All other ports on the carb are blocked off.

It's all about what you NEED, not what the carb needs. Hook up what you need, block the rest of them off.