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IMO, the Q-Jet is a much more reliable carb than a Thermoquad. Unfortunately, Thermoquads don't age well and can be incredibly tempermental -



Sorry, that's nonsense, they "age" just as well as any other carb, nothing works right if it's been broken, poorly rebuilt or modified, or has been "tuned" by someone lacking the proper knowledge to do so properly. Once adjusted properly they require VERY little adjusting, no more than any other carb design, not tempermental at all.

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especially the later ones equipped on Lean Burn/Electronic Spark Control engines.



While certainly not the best as a performance carb in stock form, they worked fine in stock applications if all else (non carb related) was in order, however, most the time that wasn't the case.