I am having problems getting a crankshaft pulley for my 289, It is in a 72 fastback and the harmonic balancer is #C90E-6316-D1, It seems to be different then the basic one. Is there any one that knows what this balancer is for? It was on my 289 when I bought it and the motor looks to have been overhauled recently.The crankshaft pulley that was on the car and bent from an reck was,C9ZE-6312. Any help!!!