To be honest you wouldn't know if it only ever had carbs on it unless you have had the engine for it's whole life !
these engines are over 25 years old now so there would have been a few changes to them over the years...
I have also found the mentioned site helpful on some stuff...
as for carbs or efi, it's presonal preferance... but you'd be doing very well to get a complete standard efi setup for one of these now... most came to Australia with the wiring looms cut in half andd no computers... but don't be scared off by that, there is other ways....