I think you'll find the 1407 to be a great carb. It's nothing more than an old venerable AFB with Edelbrock's or Weber's name on it. They never leak..( the top comes off the carb instead of the ends...no gaskets below the fuel level). The metering rods can be changed without disassembling the carb and the very few times in 30 years that I've ever had a problem with an AFB on the road I've been able to pull of the side of the road, take a screwdriver, pop the top of the carb off and rig it on the spot to get me where I'm going.....Try that with a Holley!....no offense ...I own Holleys too and they're great, but we all have our preferences, lol.
There's also a new Edelbrock carb out that you might want to look at. It's a remake of the old AVS ( adjustable venturi system) that has an easy to adjust seconday venturi that can be adjusted to open the secondaries at any point that you like. it's called the Thunder series.. I'm carbed out for the moment, but I've had old AVS's from the past ( in a spread bore configuration) and they perform very well. As soon as I can I'll be anxious to try the new one...