If the water is coming out between header and head that means it is coming out the exhaust port (right)??if thats the case you have a cracked head, put a pressure tester on your radiator , remove header , and pump up tester to 20 lbs and look in port , assuming this is a v8 engine that would indicate that # 4& 6 are back to back , probally cracked into water jacket from ex ports ,,,,have they been ported out on the ex side??