I hate to think of what someone would have to do to make a 350F do that speed. The original magazine articles rated top speed at around 86 mph when the bike first hit the U.S. market. Mine does around the same, with a 4 into 1, and no other mods.
High compression Big bore, stroker crank, valves, porting, cam, 6 speed gearbox, ultralight wheels/tires, drilled rotors, drilled brake cover, no electric start, batteryless ignition, titanium frame, fibreglass tank/seat, and a 90# rider
Maybe then. Maybe.