the distribtuor sits on top of the cam, if the gears on the cam look like they have had 'metal binding, deformed or twisted, the gears on the cam will look the same. I red-lined my tach, I was driving down the road when this happened, I was not stationary (got rid of the tach) and it killed the power to the distributor and ground my cam. Ended up replacing the whole distributor as well. If it seems like it wont crank over, metal to metal bindingthat could be the main cap bearing on your crank. you'll know when you take the motor apart b-c , the bearings that hold the pistons in, the bearings if you take them off, will appear shredded. or have deep cuts in their metal surface. and the motor will have a knocking sound, like a trash of metal hitting the block. thats one way to tell without have to take it apart.