Hot rodders swap in late model fuel injected engines in their projects all the time. Heck, Ford and Chevy sell crate motors with the Fuel injection on them just for that purpose. You will get better fuel mileage, it will run better, start better etc. The problem is they can have issues that your basic backyarder like myself might not be able to fix. They are far more complicated. The computer will be looking for oxygen sensors in the exhaust, stuff like that becomes confusing and possibly expensive. If you have a donor truck or car, you need all the wiring, all the sensors, some of which maybe on the fire wall and not on the engine. I think earlier stuff, in the late 80s will be less complicated than newer stuff. Heck you my even need the check engine light??