Working on a 70 challenger 6 pack 440 car. The original rad i tried to get fixed they wanted a fortune to redo so i sold it and bought an aluminum one. First one wouldn't hook up to the shroud so i purchased another one said perfect fit. Had to do work to make it fit in. Bought two new shrouds one a nos it will fit the rad but the fins rub on it. Its so close to the size of the fins i'm afraid when the engine torques a litle bit it will destroy the shroud. This is getting very depressing. Any help would be appreciated.