How do you replace the fan belt on a 1968 Chevrolet Impala SS?

The alternator is the adjustment point. Loosen the bolts holding the alternator to the engine and slide the alternator in towards the engine. This will allow you to remove the fan belt. However, if you also have power steering, the power steering belt may have to be removed before the alternator belt can be completely removed. Loosen the bolts holding the power steering pump assembly to the engine and slide the pump towards the engine to remove both belts.