I don't have a horse in this race, because I don't know Webers well enough to give you actual numbers. There's plenty of information on line about selecting these parts based on engine size, RPM, VE and throttle diameter.
My 1st choice: http://www.teglerizer.com/dcoe/webertune.htm
However, there's no way you can finalize the tune on these without the motor already done - that includes air cleaners, cam timed in place, ignition advance and curve, full exhaust system.
All you're going to get from Clifford or anyone else is something good enough to start, idle, have some response and not do any damage.
On that basis, Webers are worse than Holley 350s. They're not magic, it's the really precise tuning that develops the extra power.
If you cannot, will not chase down that last flat spot you're throwing money away for something to tell the guy on the next bar stool.