The question on which fuel system you run will depend primarily on applicable laws in your state. If you are planning to have a smog-legal truck after the swap, you will need to keep all of the specified smog equipment that originally came with your donor motor (also available from the junkyard). The engine can also be fuel injected, which in turn means you will need a computer to manage the fuel system and other engine essentials. You can contact Howell Engine Developments, where you'll find the necessary components for fuel injection and wiring applications for most V-8 engines. If you are fortunate enough to live in a state where smog laws don't apply, then carburetion is probably the easier and least expensive of the two, and can easily be tuned for high-performance applications.