'68 Barracuda Notch

I sold my house and until I find somewhere else, the car will be staying at my brother's house. On the 30 minute highway drive to his house, the car got hot about half-way there. The gauge never pegged out completely, but it began forcing coolant out of the cap. After it started getting hot, the car would ping with a moderate amount of throttle.

I thought maybe my radiator could be plugged up (or worse the motor). I guess it couldn't hurt to have the radiator tested.