1/4" Phenolic Insulator kit 1957-58 It is also a good

It is also a good match being aluminum if you are going to use a 1966 after market aluminum intake or the Trade Wind intake and leave natural

It connects to the top of the front fuel block and allows for clearance for the Ram air pan

gaskets and needle /seat

using an earlier Pontiac 2 bbl with no provisions for choke pull-off

If your J-bar is missing or damaged this is what you need

1/4" Phenolic Insulator kit 1957-58 It is also a goodThis kit also fits the popular 348s, and Olds J 2 as well as the Early Pontiac's. 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,