The Autolite 4100 four-barrel carburetor remains the best fuel atomizer for small-block Fords thanks to its simplicity and easy-to-service design. Jet swaps don't involve fuel all over the manifold and reliability is fierce. Pony Carburetors can perform a rebuild and concours restoration on your classic 4100. This is Paul Calvisi's '65 4100 carburetor with manual choke and 1.12-inch throttle bores to achieve 600 cfm. Cores are difficult to come by. However, Pony Carburetors has them in stock.