In my opinion, Holley carbs are great for all out WOT power.
They run fine and dandy on the street, too, but they give very
little time or technology to drivability and mileage. They are
sometimes a little tougher to tune and they have gaskets below
the level of fuel. I personally used one on a Ford 460 that
I liked, but I switched to an Edelbrock; I got tired of draining
fuel bowls, poor mileage, difficulty tuning and just general
problems. BG's new Demon carbs based on Holley designs are
getting much better, but for the street, my absolute first
choice is the Qjet. No other carb is as good at linear metering.
They also boost torque with their tiny primaries and don't
usually give up any HP with the huge secondaries. I have them
on every GM V8 I own and I find them to be incredible.
My second choice would be Edelbrock. They don't quite as well with
transition metering, but they are incredibly simple and easy to
tune for the DIY tuner.... and don't let any advertisement fool
you, no carb runs great "out of the box." I have my Qjets
custom tuned by Jet, and they need some tweaking after they're
on the engine since every engine is a little different.