Idling motor with little fluid in trany ?

Nooooo..... Would never do that!

I have everything together except driveshaft. I would like to break in the motor but dont want a huge mess when i take the cap off the end shaft of trany to install driveline.....
I want to minimize the amount of fluid in trany and wasnt sure if the trany circulates fluid in park as it does in reverse thru 1st....

I wont get my prop shaft back for a week or so....