I have a 1965 Dart with a smallblock, and installed a champion three row radiator ment for a b body, which required opening up the core support about an inch and a half wider. Between the extra core and the B body sized rad, the room available for a clutch fan is not enough, leaving zero clearance for even the new shorter fan clutch the way the rad is mounted now. But all is not lost, it looks like l can get the 3/4 inch clearance I need by further trimming the core support at the top and sides, bringing it out away from the motor the max possible and still leave enough stock core support.