While my 76 was still a daily driver, I ran an Edelbrock, and it did fine (10 mpg, no matter what)
When it became a trail vehicle, I went to a Q-Jet, and that served me well.
I've never had any kind of luck with Holley, some folks swear by them, I kind of see them as nice paperweights.
I've always wanted to use a Predator carb, ever since seeing what they do on the dirt tracks, and they are a curious design. They're not cheap though, which has held me back (I've never run across one at a swap meet either, and never bothered looking on Ebay or Craigslist for one)