I helped build Paul's Zagato. The mod to the gearbox was to ease the gear ever position using the 5 speed tail casting mated to the 4 speed box. We obviously had to cut the tunnel in the same way. I we remember the Coupe which Paul used as his back up car for his HSCC championship win with the Zagato. As for the Zagato, the gearbox was not the only mod we did...