How do you change a oil pump on a 1972 Pontiac?

To change the oil pump on a 1972 Pontiac, first disconnect the battery and drain the engine oil. Remove the oil pan by taking out the bolts and gently prying it loose. Once the pan is off, unbolt the old oil pump from the engine block, replace it with the new pump, and ensure the pickup tube is properly aligned. Finally, reassemble the oil pan, refill with oil, and reconnect the battery.