Fanbelt problem

A '67 Dart /6 radiator should have a curved lower radiator connection. If the radiator has been changed to a later version or a one-size-fits-all replacement, the original style hose might not work. If that's the case, use the '68 and newer type hose for a straight lower connection. There are various hose brands and some fit better than others. Some must be trimmed to fit properly. If worse comes to worse and you're not worried about a stock look, some later A-bodies and F-bodies used a belt shield bracket that prevented any rubbing on the hose.
Good Luck, Mark