New Carb

Another vote for the Street Demon here, I have the 750 cfm version on my built 360 Magnum. I've messed with ThermoQuads, Carters/Edelbrocks and Holleys and the Street Demon is like a combo of all 3. Secondary air valve and primary metering rods like a TQ or Carter/Eddy, available plastic main body like a TQ, but is made by Holley and uses some Holley parts (secondary jets for example). It also has dual mounting bolt patterns so it will mount straight-up on either a spread bore or square bore intake. You'd need to check the throttle bore alignment if putting on a spread bore manifold though, might still need an adapter if it's a factory iron TQ manifold.