there were, back in the old days, alot of people into the carb rebuilding business. However, for some of them, the emphasis was on the SELLING part of the equation. As long as you got something that worked, at least for a while, these places were making money. The idea was to get them out the door asap. Sure, the comebacks would happen but the idea was that after you had it installed for a while, it was your baby! Heck, you could buy a rebuilt Q-jet from J.C. Whitney. {maybe even still today, not sure}
It's kinda a bad deal cause Q-jets got even more of a bad rap. When fuel injection came along, eventually, alot of the good carb shops disappeared so the mass carb builders had free reign. After all, where else were you gonna go? There werent much choices. {unless you had some carb guru in town} The big auto chains supplied what they could but profit was important to them.
Now it is 2010. It's hard to say what you will find when you crack open you're carb. Probably a fifty/fifty shot. Either it was built by a decent carb shop back in the day before FI or it will be a cheapo junk rebuild from some large chain auto supply. (unmolested carbs excluded of course). The carb guru is not considered outdated anymore but is in demand. (at least I'd like to think that).
.........just my .02.......FWIW.......