If your kickdown rod is the round threaded kind, the 2bbl version will be too short to reach the carb as said above. Edelbrock sells a cheap threaded extension a couple inches long to correct this problem. Summit sells them, they come in two different diameters depending on which diameter threaded kickdown rod you have. You will be happy with the upgrade. The Thermoquad spread bore carb you probably have will have an agressive sucking sound when you crack the secondaries open! You may not have to re-jet the carb, just clean up and re-gasket if you are half lucky.