Your talking fuel pumps right? Walbro makes stock in tank fuel pumps for many FORDS.I've done many fuel pumps at work and I always look at the manufacturers stamping. They usally say WALBRO. Anyway.
LOL, looks like your not getting the response you want. HEH, Supercharger right. Maybe someone else has input, but both are Walbro, both are very good, and from what I hear the bigget one is just as quiet as the smaller. Seems like you can't go wrong with the 340.