Thay Do work well with Quick Fuel block and there own meter blocks Fishy! But Holleys gaskits mess match as well And Thay have two types of main bodys one that sopports 4 corner idle Circuit and another that just covers a 2 circuit. I also had one Defective 1 that no matter what I did to the carb It didn't change a bit. It had A Hole that wasn't drilled to were it was suppost to!