I have used both EFI and carbs, and found that each have their benefits and drawbacks. Carbs are relatively inexpensive and simple to install but they dry out and get gummed up if not used frequently. EFI is pricier and can be a project to install (electric fuel pump and return line to gas tank as examples) but does not dry out and cold starts well as mentioned above. EFI uses less fuel. You may have to take the car to an EFI specialist with a dyno to get the most out of it.
At this point I am using Holley carbs, in particular their 750 with vacuum secondaries. After some minor tuning of the carb, the car works quite well once warmed up. I cannot be happier with the amount of power I get from the carb. I don't think EFI would produce any more power or drivability although it will probably use less gas.
EFI can change the sound of the engine. Since it squanders less fuel, the engine's sound is truncated a little but still makes good power.