I was just weighing up the BB drive ratio. I suppose the extra revs and power available from Ford engine would align nicely with the higher quoted top speed, given same gearbox and drive ratio. Note sure of Super 3 rear tyre circumference though.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone