* Older Silverados (generally pre-1980s): These trucks almost certainly used carburetors for fuel delivery.
* Newer Silverados (1980s and later): These trucks use electronic fuel injection (EFI) controlled by a computer (Engine Control Module or ECM). There is no carburetor.
Therefore, the answer is neither/or, depending on the year of the Silverado. If you have a specific year, I can give you a more precise answer.
