Need help tuning a six pack

The first and most important thing I've found on setting up a Six Pack is to make sure the outboard carburetor's butterflies have a super tight seal against the base plate. This is easy to check: With engine at idle, no air cleaner, put your hand over each carb, one at a time, as if to choke it, and see/feel if either is pulling vacuum.
If either carb is drawing in air you have a butterfly to base plate problem and you'll tear your hair out trying to adjust your primary carb. The only way I can put it is those outboard carbs should be turned off completely- as if they weren't there.
At that point you can set up your primary- with the outboard carb linkage temporarily disconnected. Now your setting up a two barrel- no problem. If your outboard carburetors still have the factory seal you shouldn't have to mess with them unless you have made major cam/compression ratio changes to your engine, then jet changes may be necessary. Basically your outboard carb's are either on or off; your driving around with a two barrel until you step into it. That being said, you can adjust your linkages to bring the secondary carbs in at an earlier RPM for serious thrashin'. Just remember; you will be using twice as much fuel, and if your riding around town like that you will be washing the cylinders with gasoline- Not good.
Hope that'll help you.
TPG