Rubuta ci gaba ga wannan sakin layi - Broadley ta shasi ya fi sauƙi da kuma sweeter-handling fiye da na cikin gida RA273. Motar ta fara yin tasiri sosai, ta lashe tseren farko na gasar zakarun duniya, Grand Prix na Italiya
a garin Monza. Direban John Surtees ya jagoranci daga Jim Clark's Lotus da Jack Brabham's Brabham a zagaye na karshe, bayan Clark ya ƙare da man fetur kuma Brabham ya gudu. Duk da haka, RA300 ya yaudare ya yaudare, kuma wannan zai zama kawai motar da motar za ta jagoranci. Ya kasance kawai motar F1 da ta taɓa cin nasarar ta a farkon Grand Prix, kuma a kan kawai zagaye zai taɓa jagorantar.