There are a number of high performance carb rebuilders around the country (including Carb Mike) that would be happy to race tune your Q-jet.
There is one shop in Texas that Wag found and they will redo anything...
it runs about $400 to go through the carb and do all of the mods....then do an actual run-in on the unit....they include flow bench numbers and all.
Wag had his gone through by a guy here in St. Cloud who is well known for his GM performance.....so it'll be interesting to see how our bikes run this spring as they have always been almost identical in performance from day one. That's one advantage I guess we have hda, if one changes something we could always have the benchmark of the other bike to rely on to see if it worked.