I took two Edelbrocks off my dual quad setup and put to Street demons on... I've been inside the street demons several times getting the calibration correctly and they are almost identical inside. Both using metering rods and primary jets that are stand-alone to the street demon as in they don't have as many options as an Edelbrock. The Edelbrock / Carter has been around for all these years and has 50 different sets of metering rods and infinite amounts of primary Jets. Where the Holley Street Demon has about eight or nine sets of metering rods and 6 or 7 primary Jets in total.. and there are specific to the street demon.
Street Demon does use Holley secondary Jets so the secondary can be anything you want it to be. The difference between Edelbrock and the Holley Street Demon in the secondary door is merely the battle Brock is permanently weighed and the Holley Street Demon has a spring-loaded secondary that's the only part that's like a thermoquad for the most part. Dual quad setup this creates a crap ton of challenges what's a normal guy wouldn't see just putting one on his car...