my experience with quads is that if its good, it's good. The original quad off my 68 would never idle, 3 carb shop rebuilds, a few home rebuilds and it would never idle. Pulled a quad off a project we had that had not run in decades, just plopped it on the motor and ran perfect. Went to an Edelbrock carb, thats my go to carb for a 4 barrel. Usually pretty close out of the box, only needs a little fine tuning. Have had a dual quad setup on my hot rod for close to 30 years and its been perfect with never really needing any tweaking. Currently have a holley on it now for a more factory correct look and first went with a correct 780 DZ carb, was too much carb for idle and low RPM but man that thing was a screamer when you went to the floor. Now have a Holley 600 and its a much better carb and the motor still screams. Though my favorite carb when dealing with my older cars is a old Rochester 2GC 2 barrel. I love the look of tri powers and 6x2's so always tinkering with 2GC's. I have found they have been the best all around setups for decent performance, okay fuel economy and killer looks.
