i have it set up with progressive linkage. It has a Carter Proformance 600 on the back (primary). The front carb is a edelbrock 600- 1406. It's got a slid loop a little closer to the fulcrum point. It allows me to run the primary carb for about a 1/3 throttle, but after that "say hello to my little friend!" The second carburetor opens up faster, and cattches up to the front. For me it gives better street manners.View attachment 20150305_133838.jpg
