The working components of a race car like the Ford GT can be very complicated, with many different makes and models of race vehicles on the track and street it can add more complexity to the work on the cars. I strongly advise you invest in getting a quality education from an automotive mechanics program. You will need to learn the basics which is how to repair engine, brake systems, electrical systems, suspension, heating and air condition.
Next, you have to know about race engine construction, body and aero-dynamics application, chassis set-up and fabrication, body panel fabrication, engine tuning and dyno testing. These are more specialize areas where you might not need to know them all but mastering a few or one area will set you apart from the rest.
If you enjoy racing and like to work on pushing out the limits of race cars, don't mind the hard work and long hours, then working in a race car mechanic job might be a Dream Career for you!
Ford GT Specifications