Well, as you see it's on my 261 and it works quite well.
What I really like is the simplicity of it.
- only a few parts - it works on pressure differential instead of vacuum, so it is self adjusting no matter if you drive in the mountains or at sea level - good mileage (nothing sensational though) - good power - very clean burning - no circuits (idle/transfer/full/boost etc.) to deal with - pretty much just one seamless variable "jet" - infinite adjustable in every regard - easy to tune - some had even a variable vacuum port to fine tune your distributor - mixture is independent of float level, but fixed to trottle position and engine demand (we all know how critical float level is for AF-ratio, have you ever imagined you float while driving?)
So yeah, I'm pretty happy with it.
The only downside so far is that there are no replacement/service parts available, so I keep buying them, whenever I come across a halfway decent priced one, just to have them as donors.
There are also a ton of different models/versions out there - some are more complicated or have more features, like an additional enrichment circuit instead of a choke. Also there are later versions from licensed companies (Reese/Minou/Brown etc), made long after Bob Fish was out of business.
