Start the engine, and allow it to run at low speed for a few minutes, while checking for leaks. Stop the engine, check the oil level, and fill as necessary. Restart the engine, and fill the cooling system to capacity. Check and adjust the ignition timing. Run the engine at low-to-medium speed (800-2,500 rpm) for approximately 1⁄2 hour, then retorque the cylinder head bolts. Road test the car, and check again for leaks.
NOTE: Some gasket manufacturers recommend not retorquing the cylinder head(s) due to the composition of the head gasket. Follow the directions in the gasket set.