Just read about the 67 crankshaft, two years ago my shaft broke completly into. Took car to a Chrysler guru (head mechanic on chrysler drag team) he stated that he thought it was a factory defect, didn't know what took it so long to break, oil was always up no real hot rodding etc, anyway we redid the thing with a little cam and oversized pistons 750 cmf edelbrock and it's great will show it off at Lowell's. Dickedo 67 Imp conv.