thats the thing with ANY carburetor... finding one unmolested is about as rare as balls on a rocking horse... for the Qjet and 2jet, we are at or quickly approaching 40 years since the last ones rolled off the assembly line. A Holley you can get brand new still, but finding someone who TRULY knows what they are doing when tuning one, and not just winging it (and there is an element to that anyways) is even more rare. Some of us tinkered with these damn things when we were kids, but at the time, every corner speed shop had jets, and the spec sheets were a bit easier to find. Once you get a couple of rebuilds in, can anyone be sure that someone somewhere didnt put the wrong gasket in, with "bigger is better" jets, metering rods that dont match, or are just worn out... the list of faults can be endless. Couple that with substandard parts that arent even close to what they are supposed to replace directly, and you have a recipe for a nightmare.....
this is where the hatred of carburetors comes in.... Myself, give me a set of points, and a "good" carburetor, and I can make it run, and keep it running long past when your EFI has crapped out every sensor, and is useless. I doubt in 20 years we see the "revival" shows like we do now with "modern" engines.... Hell VGG tried to revive an early 80's 8-6-4 Caddy with the original injection, and failed miserably to get it running (not that they ran great when new....) but the obsolescence catches up with electronics faster than good old dribblebox carbs.....