I'm familiar with PHF's on my 1000 Guzzi rider. Dellorto carbs seem to be quality devices . Models with accelerator pumps can help lower speed throttle response on engines very large carburetors. I was considering them on the lSR bike but the lower priced Mikuni TM's got my attention.
79 T140D, 96 900M Ducati ....On a bike you can out run the demons..