'72 400 engine pulleys on crank and water pump appear to be off by about 1/16". The crank pulley sits in farther to the engine. I have the spacer ring on the outside face of crank pulley as someone suggested. But, it seems if it was installed behind the crank pulley it would be spaced correct. I also have a '73 400 engine and it is installed the same way and has the same misalignment. It actually threw a belt while I ran it on a run stand. What causes the alignment issue?