To use a 4-barrel carburetor, you'd need to undertake a massive and impractical engine conversion, essentially rebuilding the entire intake manifold and fuel system. It would be far more cost-effective and easier to simply repair or replace the existing fuel injection system. Such a conversion would involve:
* New intake manifold: The 4.3L TBI intake is not compatible with a 4-barrel carburetor.
* New carburetor: You'd need to source a carburetor appropriate for the engine's displacement and application.
* New fuel pump and lines: The fuel pressure and delivery requirements are entirely different.
* New fuel filter: Necessary for the new fuel system.
* Distributor and ignition system adjustments (possibly): This might be needed depending on the carburetor chosen and its interaction with the existing ignition system.
* Extensive fabrication and modification: You'll likely need to adapt and modify various components to fit together.
* Proper tuning: Getting the carburetor properly calibrated for the engine would be challenging and require specialized knowledge and equipment.
This level of modification is generally not feasible or worthwhile. Stick with repairing or replacing the existing fuel injection system. It's far simpler, cheaper, and will result in a more reliable and efficient truck.
