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you did not say what year the car is. remove starter get one of those rad pressure pumps pump about 4 lbs & see what you got. if it,s an early eng block off the over flow pipe if it,s a 40 or later the pressure kit has the adpt. you need, heres a tip if your buying a flathead eng .you take a small hammer & tap about 1/2 3/4 above the pan rail this is where the flathead is very thin when it left the factory after 50 years they can rot through you would be suprized how maney blocks crumble there . i hope that is not your proulbem . but i have seen plenty of them leaking there after a cooling system cleaning.