First off, Nebhal doesn't make anything, he only sells other peoples stuff (Holley, FAST, etc.) and what is being referred to here is the F&B system. You are MUCH better off buying straight from F&B than dealing with Rich.
I personally have 2 EFI 6 packs and am currently putting a Fitech "Tripower" system on a car for a client. I have run carb 6 packs since the late 70's so I am very familiar with both systems. Every time this subject comes up there is a onslaught of "don't do it" "learn the carbs" guys and while the carbs are not necessarily a bad thing they can (and usually do) create a lot of pain for someone not intimately familiar with them and someone who does not drive the vehicle frequently.
I am not hating on the carbs at all, I grew up with them and have a fondness for them but I will never run another one unless I were to somehow magically find myself with a numbers matching V code car (super highly unlikely) and even then I would still probably put EFI on it.
The main negatives for EFI are fuel system and electrical system changes/upgrades. EFI MUST have a solid capable fuel system which typically means new lines (feed and return), a new tank, etc. Yes there are work arounds and it can be done "on the cheap" but this (IMO) is not the way to go. If you are going EFI spend the money and time to develop a solid reliable fuel system. Additionally EFI DEMANDS a clean strong electrical system which many find to be the largest stumbling block. You cannot just throw a EFI system onto the car and get it to work without getting into the electrical system. You might get it to fire but you are going to have nothing but problems. Therefore you must take the time and spend the money to make the electrical system work with the EFI. This is not super difficult but it does require your factory system to be altered.
As to tuning, this is something the EFI haters love to complain about and throw red flags at. There are essentially 3 different systems out there; self tuning only, manual tuning only and self/manual tuning. Pretty much all of Fitech's stuff is self tuning only as in the FAST EZ 1.0 and many others. The Holley HP, Terminator, etc. systems are self/manual systems meaning that you can tune them (via a laptop) and they will self learn. While laptop tuning seems like "Black magic" it really isn't and many will find that once they get into it is actually easier than doing it the "old school" way.
The EFI system is only a piece of the puzzle, as stated there is also the fuel system and the electrical system but there is also the ignition system. In the EFI world there are basically 2 types of systems as it relates to the ignition; stand alone ignition (think factory systems) and integrated systems. What this means is that in the stand alone system you must set and manipulate the ignition (timing) manually just as you would have to with a carb based system. In an integrated system the ECU controls both spark and fuel (all EFI systems control fuel). An integrated system (like a Holley HP system with a Hall Effect distributor) is what most think of when they think about an EFI system and this type of system is tuned with a laptop but they also self learn.
Those who say or comment that "self learn" doesn't work has had experience with a problematic system. If the system is solid and working it will self learn and you can feel/see it happening, the more you drive the more it learns. You can feel the difference over a relatively short amount of time.
Lastly, an EFI 6 pack system is awesome BUT it is not a cheap endeavor if you are going to do it right/correct. That said the rewards (visual, reliability and drivability) are significant. Having said that EFI is not an "easy button", you still need to understand the basics (and more) just as you would have to with any classic car. A carb based 6 pack system is much simpler to be sure but I also know the frustration of having problems with them especially with todays fuel and what it does to them. So what I would say is this, if you are having some problems, send the carbs to someone like Scott Smith at Harms, have them rebuilt to a known condition (so you are not chasing demons). Find a source for "clear" fuel and only run that or at least only store the vehicle with that. However, if you want EFI then by all means go for it, they are great but they are not plug and play but they also are not magical or rocket science.
