[T-P Auto]

Denee;
I would also go with the Q-jet.
The Q-jet was the stock carb on most GM engines for a lot of years.
The Q-jet can be get from 15 to 20 mpg all depending on the trans n gears in rear end.
I have a 78 350 2bd that get 15 mpg.
The whole thing with 4bd carbs is as long as you keep your foot out of the back bds you can get fair mpg.
I just have never liked Holley for a street type engine.
Hope this will give you something more to think about.

Tim