57-58 End Carb Throttleblades Tri-power Engine Compartment Increased air flow due to

Increased air flow due to reduced thickness of filter element with excellent filtration

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

resulting in hard starting

I do have swing arm available for $90

If your is missing or damaged this is what you need

57-58 End Carb Throttleblades Tri-power Engine Compartment Increased air flow due toThis also fits all small base Rochester end carbs, including J 2 Old's, 348s, and early Caddy's. Excellent quality. Manufactured here is the USA. Although this is an exact copy of the original, installation in a used throttle body does not guarantee a perfect result. I include a small quantity of DAG213 which will be required to seal these perfectly. It looks like black paint and is applied to the edges of the throttle blades after installation.