Interesting topic. On my 69 440 air grabber I have black rub marks on the top of the air cleaner lid towards the back, factory carb intake ect.
What would cause this ? I did have a bad motor mount which I replaced, maybe this caused this, do some mounts make the motor sit higher ? Also I have heard some of the older repo air grabber seals were made a bit to short in length which will cause this.
