Your dad smoked the clutch If he want to race have it change your clutch and pressure plate, get a tachometer so that he can change within the power band of the cam, gear changing is up to him. This is risky, I would recommend that tell to your dad not doing that. Some cars that he see's doing that are build with a clutch that can withstand the great amounts of heat and friction, your's is not.

Tell him, don't waste your time and your engine. Its your car.