Oil Change confusion

So I have a deep transmission pan on my 727. It's a MOROSO aluminum
DEEP sump pan.





I have a leak around the front of it between the pan lip and the transmission so I am changing the gasket.

It has leaked for a while and I just kept the fluid level up when it did leak.

Now I want to change the gasket again but I am not sure how much oil to put back in. I did not drain the cooler lines nor the torque converter.

I was told that 4qts is typical for this type of change...does that sound right?

I know your supposed to check in N when running to determine the level. Unfortunately I am using an aftermarket Lokar dip stick and it is impossible to get an accurate reading...it always looks like its over filled on the stick.

So anyone out there wanna set me straight on how much oil to put back in.

Yes I am measuring what comes out as well but not sure if I overfilled before due to adding oil frequently.....just looking for a base point.

Thanks,

Mop