This kit also fis the popular 348s, and Olds J-2 as well as the Early Pontiacs. If your tripower has three small Rochester carbs, this fits. Kit includes three precision cut insulators, set of 12 studs and new, plated nuts. Studs are made for this application...not a generic piece. Studs have the correct 5/16-18 threads into intake and 5/16-24 up on top. Kit includes 6 gaskets, which you will need. Solves issues with fuel boiling in the bowls, spilling onto the intake, and flooding the motor.