I don't regret it, but it is a fair investment and the fuel system is most of the work. Yes, it does run "better" than the out of the box, 30,000 mile AFB I had. Starts easier, uses a very small but noticeable amount less fuel, smells less. I did it on the cheap, and I think my total was $1150 for tank/lines/FiTech… And is it $1150 better, no, definitely not. Not to me. BUT to my wife (smells less). And to a noob at classic cars that have no clue about automatic chokes, or carbs that evaporate empty over weeks with the crank/pump, and how to not flood a car. It might make a car pleasant that is almost undrivable to them. I am also planning on controlled spark, and that is a lot of the reason I went with it as well, and that will not cost me any more.
Plus I am going to experiment with E85 which is dirt simple now, just type in a 430 CI instead of a 350, and try it out.
Also adding in A/C it will automatically bring the idle back up similar to a modern car when the compressor engages.
IF I bothered to tune the carb we had, and IF nobody buy me ever got near it, I probably would have regretted it just on the expense. I don't have any complaints, not one, about overall performance/drivability/or other issues. But I always would appreciate having that $1150 in my wallet again. I would assume most guys would not cheap out like I did, and would be closer to $1,800 or so.