That means it must be a 'square bore' pattern carb.
HP goes up with rpm. On the street you'll want to focus on Torque.
If do Ed'ks are based on the Carters. They had a rep for better than average good out of the box performance than new Holleys. However they have more adjustability, so you'll need to learn more about carbs to tune them. But they do let you tune for more variety of conditions without breaking out the wires, drills and tapps. Avoid the 750 as the several reputable sources report the booster is too high. It can be extended, but that doesn't match what you're asking for.