Just got done with my first ever dizzy "adjustment." Only put on a new O-Ring, seal, rotor, and cap. Too bloody hot to do wires and plugs and I'm too darn tired. My question is how is the distributor supposed to look? When I took it out, it was black. My heart sank. I realize that the old O-ring was done miles ago b/c it was leakin' everywhere. But would a bad O-ring make the distributor look this black? Or do I need to clean the heck outta the engine?