Oil Priming on a 340

If the engine was run on a stand when it was built or really more precisely- if you know the distributor was in the right place timing wise, pay attention to what way the slot is pointing before you pull the drive gear so when you drop it back in and it rotates on the gears you can cuss and pull it up again, move it a little and drop it in the right place.
I made a pulling tool out of an old wire coat hanger. It has a C shape under the drive gear, then is bent to come up through one of the gear slots and then bent again to come straight up through the distributor hole.