How full is my oil pan?

I was wondering at what point does it start pushing against the seals? Like my 8 quart milodon oil pan, if I was to lay on the ground face up and pour oil in it at 8 quarts would it make it up to the seals?
I reckon when installed there's things like the pickup tube that are displacing oil.
I'm just never tried it.
Thank you for your experience.