Before I drop my new motor in, my manual suggests replacing the front pump seal. It was not leaking before. I'm generally one to believe if it ain't broke, don"t fix it. But its probably the original seal ('64 Barracuda) and nows a good time. Does this seal pop out from the front, or do I have to unbolt the cover and remove it from the back side? Or should I even mess with it at all??