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IDFs are the ideal dual carb kit, with one barrel for each cylinder (better tuning). Run 40 IDF for 16-1800s in heavy vehicles like T-2/3s. Run the 44 IDF with the 1600S option for 1600s in T-1s. Run 44 IDFs in 1900-2100s, and 48 IDFs in larger (or race) engines! Tell us your application when ordering, and we'll set you up! 48 IDF should ONLY be used for high output engines (160hp and up). If you buy your carburetor kit from us, you will only be required to purchase one more set of jets other than what come in the carb kit. If tuning tells you that you need jet changes (doubtful since our kits are very close out of the box) more than your purchased jets, we will exchange them with you for no additional cost to you until it's right. I know of no other company that will offer this program. We support our customers!