Carb Advice Appreciated

starting to research carburetors, which I admittedly know little about. The Holley store has a 600 replacement carb for $540 (shocked me), and something called street brawler for a little over $300. I also have access (my brother) to a factory rebuilt thermoquad from a 74-77 440 truck, but I'm afraid that'd be over my head. Any suggestions would be appreciated. My app will be a 340 x head motor with a .474 purple shaft (I have other options to tone that down, but thats whats in there now) and a Weiand dual plane (also have a Performer if that's better.) Its going into a 67 barracuda convertible that will be used for Sunday drives and going to car events, never race or really push the motor at all. In the early 80s the motor took my brother to college everyday in his 68 valiant, and I loved the sound of that car. It has a Torker II and a dual feed 750 on it that I have to give back,, which is fine because i think those both run counter to my application. I have a Crane .443 lift cam if need be, and ill be running cast exhaust manifolds.. Appreciate any feedback guys.