The Stovebolt Site Forums The Shop Area Engine Shop Carburetor Insulator Necessary?

I am putting a Rochester B Carburetor on my 1953 Chevy with a 216 Engine. It doesn't currently have an insulator between the engine and the carb. Is that something that is necessary? Is that an item that can be purchased at a local auto parts store or does something like that have to be special ordered?

Thanks!
Jesse