Damn Thermoquads.

I love TQs. I just love them. If you spend a little time getting to know them you naysayers might too.
I think most guys just want fast relief and are willing to plunk down the big bucks for a race carb, and then complain about the crappy fuel mileage.
Holleys are for fast adjustments. Fast jet changes, fast PV changes, and a very tuneable pump system.
Since they were designed for racers, who cares about the idle circuit, as long as it will in fact idle.Who even cares about fuel mileage on a race car.This is where street carbs excel, stretching your fuel dollars.
On the street, we don't need to get into the power jetting on a continual basis, to wring out the last 5 horsepower. Heck the speed limit is 60/65 and we can do that sometimes in first gear. So as long as the power system is close we are good to go. But we spend a huge percentage of out time on the low speed circuit, and the powervalves. This is where the TQs are fast, easy, and can be tremendously accurate.
So some will say you cannot get fuel mileage into the deep 20s with a Holley, and for the most part they might be right. But give me a TQ, and when the Holley maxes out in mpgs, the TQ ain't even breaking a sweat yet.
Oh and about that fabulous accelerator pump system on the Holleys? They need it to cover their other deficiencies. And if you have to ask, then you will have to spend a little time getting to know them, both of them.
Each of these has their pluses and minuses.
I have seen junk examples of both.