Used in the restoration of Edelbrock 1407, a wide range of jets, connecting rods and springs. I believe this is essential to tune Edelbrock to your unique application and allow for future flexibility. Be sure to check out the online tuning chart to find the best rod and jet combination to start with, and have fun experimenting as all of these items can be replaced with a carburetor on your vehicle. Both front and rear jets are interchangeable for maximum performance. I would recommend enteringβ¦