This is the COMPLETE Holley Quick Change Kit for carbs with vacuum secondaries. Never used or installed!
Older style that can be used on Holley Carbs with electric choke or manual choke feature
Kit includes cap, cover, o-ring, port gasket, electric choke gaskets, and bolts to re-use your existing manual choke cable bracket (if you have a manual choke, just install your choke cable bracket under its current position--kit includes longer bolts and nuts for this purpose).
Also includes the 5 color-coded springs to adjust the operation of your secondaries and all instructions and a spring-rate data sheet. This COMPLETE kit sells for approximately $50 (Current Part Number is 20-59K). Don't confuse this kit with the newer & similar kit that does not include the 5 springs.